A local bulletin board has a photo of a Sauer & Sohn pistol for sale, allegedly manufactured somewhere between 1913 and 1930.

No other information at this time (I have messaged the seller, but no reply yet).

Do any of y'all recognize this? Any idea of what it's worth -- what should I offer, if I'm interested in it?

Sauer 1913 probably .32 ACP.

Upload the pistol image to a search engine or your choice of AI interface.

Looks like a 1913 to me too. Holster is WWII German for PP/PPK/HSC Mauser. Possibly.

I think that might be a .25 ACP

V-Tail, if you buy it and want to get rid of the holster I need it for my 1940 Walther PP