One of many 22 single action revolvers made by the company
Have it checked by a gunsmith.
http://www.tm-techmark.com/jspacek.htm - This site specializes in High Standard.
50-140
The High Standard R-100 revolver uses .22 Long Rifle (LR) cartridges. This versatile caliber is widely available and suitable for various shooting applications, including target shooting and small game hunting. The revolver is designed to accommodate both standard and high-velocity .22 LR ammunition.
Made for Sears by High Standard, and is a version of the Double-Nine revolver.
S&w
22-72
Smith and Wesson Model 1
All of them have a sn.
The standard caliber of a biathlon rifle is .22.
A .22 caliber Iver-Johnson Cadet revolver.
300-500