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If I was guessing I would say 1950,s.
Aero may have some information, if I find out anything from them I'll post it.
They plan to investigate when they have the jacket in hand
Ah I see, definitely no rivets. So 1940,s or 1950,s?
There must be a catalogue some where!
I have reached out to a few universities/ libraries so am awaiting responses.
Fingers crossed