I have a K22 with sn 659XXX and it chipped in December 1936, so yours was close. You have a very nice 38 M&P and you should be able to trade off those nice 1920s convex stocks for silver medallion stocks. Post a WTT on this forum. I recently was able to trade a 1910s set for a nice 1930s set that way.
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Gary
SWCA 2515
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