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John Chapman has them on his CD. This is what he says about them:
"The M-69F series of jackets was made in the same contracts which the M-422A were made, in 1941-1943. The jackets are warm trenchcoats which were often seen in English and Arctic climates where the Navy worked in WWII. The majority of them appear to have gone to England, as the Navy had massive anti-submarine patrols around the country. The jackets are made with the same materials that are seen on M-422A jackets, with the addition of Alpaca in the lower lining."
I have owned a couple in the past. I still have a mint G&F one that I can't part with even though I don't wear it. It's an amazing garment. Tons of thick goatskin go int on one of these and like others have said the materials are the same as you'd find on an M-422a. I wonder how many skins were used to make one.