OK, I collect pre end of WW1 32Auto's. I have an FN1900, FN1910, FN1903(9mm Browning long with a bushing converted to 380Auto), A bunch of different german 32 Autos (Walthers, Dreyse, etc.), French MAB, Savage, and a bunch of Colt 1903's (Type I, Type II and Type III).
All of them except the FN 1903 are very, very concealable. Almost all of them shoot. Only the FN1910, the French MAB, the Walters, the Savage and the Colt 1903's would I trust in a carry situation and even then, I would probably opt for my newest (Type III) Colt 1903.
Most of these old (close to 90 to 100 year old handguns are very concealable and yet their value ranges from $100 to $500.