I believe this small box 22 conversion was manufactured in mid 1937. I have fired it several times and I do have to attest they are nice to own, however they do not function with a dam. Granted the E/77 10 round magazine has a weak spring so I purchased a post war 22 conversion magazine with stronger spring and results were the same.
With only 30,000 made, I am very fortunate to own one. I was surprised many years ago to see that ever the spacer & nuts were proofed as well as all the other parts!
George
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