Hand Ejector, no model number, 5 screw, .22 Rimfire, 6 inch barrel, Serial # 236177

Welcome to the forums from the Wiregrass! I believe you have a .22/32 Heavy Frame Target revolver that shipped before WWI. Please post some pictures.

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Guy
SWHF #474 SWCA LM#2629

The .22/.32 Heavy Frame Target Model was introduced in the catalog in 1915 at about s/n 160,000. According to the SCS&W. Does yours have a round butt or a square butt?

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Mike
S&WCA #3065

A .22 with SN 236177 is almost certainly a Heavy Frame Target model. It would likely have shipped in the late 1916-early 1917 period. Pictures would help.