Your jacket appears to be either 1949 or 1950. I would guess it is either the 1949, J-21 or the 1950, J-22. The best way to tell is by the zips on the back. If it has one "left hand" map pocket it's a 21. If it has two it's the later 22. Very interesting find since they stopped using the brown label around 1948, as I understand it. This could even be an early prototype and be a tad earlier. DD
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