I have a .32 caliber revolver made in Brazil by Industria Nacional de Armas (I.N.A.). The markings do not indicate whether it is a .32 S&W, .32 Long Colt, etc. Both S&W and LC rounds fit the cylinder but my understanding is that the calibers are not compatible. How can I determine which it is. I cannot find any history on the gun whatsoever. The revolver has a tiger etched on one side. On the barrel it says .32 I.N.A.