I agree with you about Westland probably used whatever they could get their hands on …
Not quite the point I was making. The original Air Ministry/Ministry of Aircraft Production Type Spec will have included all required instruments, one of which was a Meter, Electrical, 40 Volt DC, Aircraft for the Use Of. Another Spec will have covered the Meters themselves, which will have been farmed out to various manufactures resulting in slight cosmetic differences. This spec required the ident numbers 5U/1693. Westland would have ordered under 5U/1693 so, in my opinion, you’re fireproof using either of the above.
… but I still would like to find the actual one they used in both the early Whirlys up to P6983 and P6984 aircraft.
That’s the point, I don’t think there is an ‘actual one’. Anything with 5U/1693 on the face will have met the aircraft spec.
Anyway, let’s see some current progress photographs. And what happened to Double Zero’s post. Seems he has the info you need.
PS.
Another variation on the same part number.
