"Actually, an old chromed H&R or Iver Johnson with MoP grips might be acceptable."
The later H&R topbreaks will chamber and fire 32 S&W long ammo, which is not impossible to find at "big box" sporting goods stores, and easy to find online. The revolvers themselves can be had off of Gunbroker 24/7. A decent one can be had for $150 if you check for a couple of weeks.
Some of the earlier Walther models, mostly in 25acp or 32acp, have a funky old-fashioned look and may not be hard to find or expensive.
The Mauser Model 1910 (25acp) and 1914 (32acp) cost me $300 apiece, are fun to shoot, and cool/quirky looking. That is the longest barrel (3") and best sights I have seen on a 25 auto. I believe that is the model that Hitler's niece allegedly killed herself with.
I'm not sure about the cost and availability, but I recall the Browning Model 1900 as being kind of distinctive looking.