Jim, I have a couple of 1st Model K22s that have the first two styles of rear sights. The first year example has the one screw sight and is sn 637506. the second is sn 659371 and has the two screw sight? They were shipped in 1931 and 1936 respectively, so I assume there was a transition somewhere between these years.
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Gary
SWCA 2515
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