Antique/Vintage Pre-wwii Czech Infantry Marksmen Badge Stamped

This is a Czech infantry marksmen bronze badge marked "MSS" on the back. I believe this was made sometime between 1918-1938, but I am not certain. There is a little bit of green tarnish on the back. It is still in very good shape, regardless, and has not been shined to retain the patina.

Approximate Dimensions:
1.8in x 1.8in