The Remington Model 51 only bears a superficial cosmetic resemblance to the 1910 Browning, and since the .32 & .380 Brownings are identical with minor internal differences why do you suppose you can tell them apart without handling them?

And it was GCA '68, not 1964. As a result of restrictions in this ridiculous legislation both the "Browning Pocket" and Walther PP & PPK series were significantly modified to gain enough "points" to keep them importable, they were not banned. Both the Brownings and Walthers were modified to include target sights, thumbrest grips, longer frames (both guns) longer slide (Browning) etc. These resulted in the Browning "Sport" and Walther PPK-S. Took two fine pocket pistols completely out of the pocket pistol category!

Naturally there were other pocket pistols that simply were no longer imported!