I like this a lot. And love cartridge slides. Unlike sewn in cartridge loops, you get to put the cartridges where you want them, and if you change your mind, you can put them somewhere else.
Do you have the belt and holster that goes with this scabbard and slide?
It is a Heavy Duty, which is a .38 Special on an N frame, which is also known as a 38/44 (38 caliber on a 44 frame). Because of the larger frame, it could safely handle the much hotter 38/44 cartridge.