Technically, it's not a Sig-Sauer. It's just a Sauer, Model 38H. However, I think it fits in the thread because it is where the idea of a de-cocking lever comes from, a feature that obviously was used on subsequent designs after Sig and Sauer were joined. Introduced in 1938, this is DA/SA with a lever that safely drops the internal hammer. It also has a slide mounted safety, so it could be carried cocked and locked as well. The German military purchased 200,000 of them for issue to officers in WWII.
This wins the coolness award in my book for sure! Does it still shoot (well)?