Help-- what maker

[Cowboy]

A friend has a 25 ACP thats missing the clip. Only mark is SM inside a circle. Anyone have an idea. Can't post a pic very easy, but may have to----Cowboy

 

[SDC]

That was a mark used by Rhoner Sportwaffenfabrik, but they've been out of business for a long time; after the GCA 68 cut them off from the US market, they went under. It could be one of 3 or 4 designs, made under different model names.