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Pilot's watches. Well this was a surprise.

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Pilot's watches. Well this was a surprise.

Old 5th Dec 2013, 09:52
  #41 (permalink)  
 
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ExSp33db1rd That's the one
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Old 5th Dec 2013, 16:33
  #42 (permalink)  
 
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Welcome aboard

Well, I've found a fantastic site. Pictures galore, and good writeups.
Glad you found the site helpful, Rob - Sorry LR.

May I give you a few pointers to a couple of other threads ?

For those other posters who've had trouble with Seiko 7Axx pusher circlips pinging off into the stratosphere (or shag pile carpet):

Topic: My 'patented' Pusher Circlip / C-clip Removal Tool - Seiko 7A38 - by the numbers


A running commentary on the current selling prices for 7A28 RAF Gen. 1's:

Topic: The 7A28-7120 RAF Gen 1 PriceWatch thread - Seiko 7A38 - by the numbers

Something else possibly of interest to you 'fly boys', particularly any Springboks:

Topic: SAAF Chrono's 7A28-7040 & 7A38-7070 - Seiko 7A38 - by the numbers


Two more D-I-Y repair threads (of the many in that 'Bend it, Mend it' section):
The first one is a stainless 7A38-7000 which I built up from two ex-eBay 'basket cases':

Topic: A very long-term restoration project: 7A38-7000 with 'patina' - or not worth effort ? - Seiko 7A38 - by the numbers

The second is an ongoing repair of a 7A28-7120 RAF Gen 1 - with some irony:

Topic: Is battery terminal damage reason for dead movement? - Seiko 7A38 - by the numbers


I trust my posting these few links won't be construed as [email protected]
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Old 5th Dec 2013, 16:55
  #43 (permalink)  
 
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Bit behind the times ....

LR - I must admit that I had a little chuckle to myself when I saw how your thread started off:

Why is this particularly RAF ? Surely they were never issued as such.

SEIKO FLIGHTMASTER RAF Royal force Chronograph watch 7A38-7000 blk dial 80's | eBay
Simple - this watch has nothing to do with the RAF - the 7A38-7000 was never issued, as neither was the mythical yellow-dialed 7A38-701B 'Vulcan'.
This is purely a case of an eBay seller trying it on. Were a watch in this (poor) condition to be offered in a no reserve eBay auction, it would be lucky to make $100.

This same 7A38-7000 has been re-listed on eBay on and off since September last year.
You'll find a few mentions of it on the forum - in the 7A38-7000 model thread (which gives one possible explanation):

Topic: 7A38-7000 SAA007J - Stainless - Seiko 7A38 - by the numbers

and here, halfway down the second page of this thread:

Topic: Yet another OPPORTUNISTIC asking price for a 7A38 ! - Seiko 7A38 - by the numbers

All I can do is flag [email protected] like this and hope no 'mug punter' falls for it.
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Old 5th Dec 2013, 17:42
  #44 (permalink)  
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Ah, Mr 7A38, welcome!


A word of caution. Spending time on the Jet Blast part of PPRuNe, can seriously effect your psychological well-being, though I have learned things in here on subject as diverse as drilling wells in Texas through to mending chainsaws and on to removing one's gall bladder using only mirrors and the implements found in the typical kitchen. It's a mine of information.

I shall try to locate a lens on this side of the ocean, but failing that, I'll unpack my tools back in the UK and resume the task there. Thanks for your wonderful site.



.

Last edited by Loose rivets; 5th Dec 2013 at 22:26.
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Old 5th Dec 2013, 22:02
  #45 (permalink)  
 
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Breitling Cosmonaute Purchased in 1972. Still going strong. 140.
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Old 5th Dec 2013, 22:25
  #46 (permalink)  
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They have more scales on them than an Aristo 'computer'. I'd become confused.
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Old 6th Dec 2013, 15:16
  #47 (permalink)  
 
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Speaking of scales, and (thinly disguised) Seiko 7A38's designed for pilots' use here's a couple of re-branded ones:

A Yema N8 Flygraf:



A Kamatz 518000 'Oscar Bravo':




The scales on those two are pretty much self-explanatory (even for me) they're rotary slide rules.
But could any pilot on here tell me what the scales on a Kamatz 519000 'Tango Charlie' were supposed to do ?

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Old 7th Dec 2013, 20:31
  #48 (permalink)  
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Well, I put it on 'Tech Log' where it was promptly removed.

Shame, I thought it was a fairly interesting technical question.


VS Vertical Speed? Anyone?
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Old 7th Dec 2013, 20:43
  #49 (permalink)  
 
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Interestingly, I have just bought some parts (inspired by this thread and the fix to the buttons on my own 7A28) and had an interesting exchange with the seller of some of the parts. He asked exactly which model I wanted the new rear gasket for, so I replied that it was for a 7A28 7120. The reply was that this was probably one of the best chronographs made, and that I was lucky to own it. It inspired me to seek out a genuine new crystal (with the right ground bevel) to replace the very scratched one on mine, so having read up on how to go about fixing these things, I spent an hour this afternoon machining up a pair of plastic (ABS) dies to push out the old crystal and push in the new one to the case of my old watch. I reckon I can do this using the dies in my drill press, as I don't have the special tool.

I'm looking forward to having a fully functional, looks like new, 7A28 7120 before long, and heartily thank those here that have pointed me in the right direction to get this very nice watch back to near as-new condition.
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Old 7th Dec 2013, 20:47
  #50 (permalink)  
 
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Back in blighty wandering past one of those numerous Cash whatsit shops and a watch caught my eye in the window.



They were flogging an old Seiko Chrono for 50... normally wouldn't be interested but I knew this type... the old RAF Navigator issue from the 80's and 90's (this was the GEN2 edition) complete with MOD markings on the reverse and the P(romethium) Symbol.

Tight bastard as I am offered them 40 which was duly accepted... must have thought I were a mug (may be right though..)

Sold to a mate for 300..... nice little earner.
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Old 7th Dec 2013, 21:14
  #51 (permalink)  
 
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He asked exactly which model I wanted the new rear gasket for, so I replied that it was for a 7A28 7120 ....

It inspired me to seek out a genuine new crystal (with the right ground bevel) to replace the very scratched one on mine,
@VP959

If you've browsed this thread on my forum:
Topic: Crystals and gaskets - Seiko 7A38 - by the numbers
You may have already found the answers for yourself.

There are only two case-back gaskets used across the whole Seiko 7Axx range. You'll need a Seiko p/n FH3181B01

The original Seiko crystal p/n 300WF0GN00 is obsolete and NLA. That's why you see so many Gen. 1's fitted with any old cheap replacement glass. I've identified an alternative which is about as close in terms of appearance (ground bevel edge) and exact dimensions as you're likely to find - Sternkreuz p/n XMF 300.860

You can get them both from Cousins UK.
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Old 7th Dec 2013, 22:10
  #52 (permalink)  
 
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300 for a Gen 2!!!!

Pretty amazing, as the Gen 2 is generally considered to be far inferior to the Gen 1 (the 7A28 7120 that I have), according to the Seiko aficionados.

Makes me wonder what my soon to be near perfect 7A28 7120 Gen 1 is likely to be worth. I'd always thought it was worth a lot less than my ex-military 1969 vintage Omega Seamaster 300 divers watch (which is currently in better condition than my Gen 1 Seiko, although it doesn't keep such good time).
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Old 8th Dec 2013, 02:05
  #53 (permalink)  
 
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300 for a Gen 2!!!!
Mate loves this sort of stuff but isn't a total mug as he checked eBay prices beforehand (so did I of course ).

Personally have a fifteen year old battered Tag which has seen many a shocking situation... if only watches could speak I'd probably being doing time in some dodgy countries.. (hmm pun not intended actually)
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Old 8th Dec 2013, 05:55
  #54 (permalink)  
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Using this "computer's inner workings clock test site" I've been checking my 7A38 7000 since re casing. It was so near to perfect yesterday I couldn't detect a difference, but today, getting into the rhythm and going back to the screen, I would assess my watch has gained about 1/4 of a second. A just detectable lead. One will check it daily.

Time in El Segundo now - Time.is

Funnily enough, according to Mr 7A38's site, the setting device in the watch is defaulted to an error way outside my memory of the chronometer standard. (opens another browser to check.)

Oh, well I'll go to the foot of our stairs. My 40 year-old memory is of plus 3 / minus 0 seconds per month. The sites I looked at seemed to be saying it was nothing like this accuracy. This one has something to say for Seiko.

COSC Vs. Grand Seiko Chronometer Standards - A Comparison

I didn't put mine in the fridge or subject it to any kind of Texas weather. (+30 to +4 in a week) Or shock it with 100g. It just sat there being more or less right for 20-odd years. Now I'm puzzled, but inspired to press on with the testing.
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Old 8th Dec 2013, 06:23
  #55 (permalink)  
 
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Still can't go past my G-Shock,

All the usual bells and whistles, plus it tells the time...and the great thing is..the only time I ever have had to take it off was to get a new battery after 4 years.

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Old 8th Dec 2013, 10:13
  #56 (permalink)  
 
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@VP959

If you've browsed this thread on my forum:
Topic: Crystals and gaskets - Seiko 7A38 - by the numbers
You may have already found the answers for yourself.

There are only two case-back gaskets used across the whole Seiko 7Axx range. You'll need a Seiko p/n FH3181B01

The original Seiko crystal p/n 300WF0GN00 is obsolete and NLA. That's why you see so many Gen. 1's fitted with any old cheap replacement glass. I've identified an alternative which is about as close in terms of appearance (ground bevel edge) and exact dimensions as you're likely to find - Sternkreuz p/n XMF 300.860

You can get them both from Cousins UK.
Thanks, I have browsed that thread and found it very useful. The new crystal I now have seems to be identical to the one in the watch (which I know is the original, as I've had it since being issued with it in a cardboard box back in 1984). As far as I can tell the bevel is the same (I haven't taken the old crystal out yet to be absolutely sure), at about 0.8mm across the face. The new crystal has a bevel that looks very slightly more polished, perhaps, than the original, but that's the only very slight difference I can see.
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Old 8th Dec 2013, 10:56
  #57 (permalink)  
 
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Not quite COSC standards but close to HAQ

@ LR, ref.

Funnily enough, according to Mr 7A38's site, the setting device in the watch is defaulted to an error way outside my memory of the chronometer standard. (opens another browser to check.)

Oh, well I'll go to the foot of our stairs. My 40 year-old memory is of plus 3 / minus 0 seconds per month. The sites I looked at seemed to be saying it was nothing like this accuracy. This one has something to say for Seiko.
The Seiko 7Axx movement can be adjusted for accuracy in +/- 0.26 seconds per day increments using the rotary step switch. I've tweaked a few of my own watches and have at least ten in my collection which are keeping better than +/- 10 seconds per year.

See: Topic: 7A28 / 7A38 / 7A48 Accuracy - rate adjustment - Seiko 7A38 - by the numbers

and: Other Links - Seiko 7A38 - by the numbers (for the other links mentioned in that thread).
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Old 9th Dec 2013, 02:10
  #58 (permalink)  
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Oh, NO! 3/4 of a second fast! This can't be right. This is serious. Has the vapour of my breath been a factor? Can the watch sense the outside air temperature? (For Texas, a bizarrely cold 9c) Improbable.

Does silicone emit slippery molecules? If so, some must have escaped the confines of the button shafts. Perhaps the Time.is site is faulty, but then, most of them are taken from GPS time, and that's adjusted for relativistic effects and should be accurate to .000000000000000000000000000000000001 of a second . . . on a bad day.

One will report on Monday night, but this is unnerving, I've never had to alter it before, well, not counting when I stopped leaving it on GMT at all times.
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Old 9th Dec 2013, 02:57
  #59 (permalink)  
 
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Still can't go past my G-Shock,
They were popular with SASR types because of the durability.
Then everyone found out they were popular with SASR types, so all the wannabes went out and bought one too. I suggested the pink baby G to a friend in that line of work so he could look different from the wannabes, which was returned with a thousand yard stare.

Seiko7A38, thanks for taking the time (pun not intended ) to post that warning. Vivat internet!
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Old 9th Dec 2013, 07:50
  #60 (permalink)  
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I've just purchased another one. Gold plated this time. I liked the gold when they were new and they matched my stripey arms, but then, I've always had a passion for stainless. Glad I got the one I did.

Bloke I met occasionally at LGW showed me his gold one on the same week I'd bought my steel one. c 1985. He said he woke up with it on his wrist after a heavy session. He had a Visa receipt to bring things into focus. Still, not a bad impulse buy going on their desirability now.
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