.380 ACP (9mm Kurtz) is about 9x17 (case measures 17.2 mm)
9x18 Makarov is a Russian cartridge
9mm Parabellum is 9x19 (German design I presume)
I just purchased a Polish P64 in 9x18 from J&G Sports. Mine arrived in new, un-fired condition. A nice pistol for $150! I don't have the ammo yet so I don't know how well it shoots. It seems a little heavier than my Bersa Thunder .380.