I do not have change dates for the cylinder pins, but went through my K frames and find the following using guns in my collection:
32 Winchester
1-48K - 0 pins
85K - 1920 - 2 pins
110K - 1924 - 1 pin
38 Special
1-121K - 1909 - 0 pins
150K - 1911 - 2 pins
281K - 1917 - 2 pin
384K - 1921 - 1 pin
696K - 1940 - 1 pin
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Gary
SWCA 2515
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