Strike me pink dragartist, this is getting complicated!
I'm guessing the man mounted regulators you are talking about are these (1969 winners of the London - NY race)........
Getting to be an interesting thread. (The mask and helmet I have are just part of my small collection, not to be used).
By the way, I wonder if any of the readers had anything to do with the London to NY race in 1969?
cheers,
-John