“...1851 CSA Navy revolver repro came offered it in two calibers, .44 and .36...” [central_va, post 31]
Does your revolver have a rebated cylinder and an octagonal barrel? Six chambers? Which Italian firm made it?
Flayderman lists eight manufacturers of 1851 Navy-style revolvers for the Confederate States of America. None were named “CSA.” Many modern gunmakers have produced arms that aren’t historically precise replicas of any particular original arm.
Back in the 1850s, the terms “Army” and “Navy” were associated with caliber 44 and 36, almost exclusively. Never learned exactly why.
Colt’s did produce one model with a rebated cylinder and an octagonal barrel: the Pocket Model of Navy Caliber, also known as the M1862 Pocket Navy. It was 36 caliber, with a five shot cylinder, using the M1849 Pocket frame, slightly altered.
It has an octagonal barrel and navy scrimshaw on the 6 round cylinder. I can't remember the name of the company that made it. It is definitely .44 cal.