I have two (one is a pre model 1957)
Model 15-3 s/n K975863. No shipping date yet. I have two Model 10-5 that are in the que for their's.
Edit: the 15-3 shipped in 7/70
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Stocks match and I have the original box and the brush.
K38 Combat Masterpiece K304434 (he's right in there with both of you on yours). Shipped in December of 1957
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He has a target hammer and the stocks are original. Might do a letter on him.