Hmmm. Howbout a Portuguese Mauser-Ver_____? The odd mauser with the split rear bridge - the bolt only has a half dozen pieces, but unless you know how to put it together you cant...
The Steyr-Hahn M1912 pistol. It looks very blocky looking with stripper clip loading, huge rear sight bridge, and rotating barrel. BTW, this one was "rechambered" by the Germans in the '08 parabellum cartridge. They ran a tapered reamer into it and throated the barrel with a vengeance. Regular 9mm cases come out VERY pregnant looking. I gave a couple fired cases to a CHP instructor if she did not say where she got them. I use only 9mm magnum brass cut down to 9mm largo length in this one. Very smooth integral magazine and never a failure to feed.
How about the Astra 400? Very underrated gun. It is fun to freak out people at the range by alternately loading in a magazine 9mm, 9mm largo military, 9mm largo JHP handloads, and regular 38 acp loads, and firing groups.
Did I mention the VZ 52 rifle in 7.62x 45? It was once issued to someone named Arashi ---- (forgot). Rusty rifle with a sewerpipe bore, but groups 5" at 200 yards.
I could go on for a long time. Jeff could count on selling me any weird surplus gun that came through the door, and did so for 3 years.