I think almost all the "prohibited" pistols produced before and during WWII were well made and interesting. Almost all of them appeared in 7.65mm (.32 ACP). You might look up specific countries for their sidearms (Walther, Colt, Inglis/Browning, Webley, SACM, Nambu, Beretta, CZ, and others) and decide that way, or look at guns produced after WWI (Colt, Remington, Savage, Webley and all the many European pistols). Any one of them would be worth having. For my money, two of the finest "pocket pistols" produced during WWII were the Colt Hammerless Pocket Model (Model M) and the Sauer 38H, both obtainable (although both rare in Canada, especially the Sauer) in .32. But any of them would be good.