Welcome, 1Syclone. The diamonds could indicate a refinish, as Win 73 indicates, or perhaps replacement of a part. Refinish was usually indicated by a five-pointed star. Could also be marks on the bottom of the barrel or the rear face of the cylinder indicating factory work. If it is indeed .44 caliber, .44 S&W special, the serial number indicates it could be a .44 Hand Ejector 1st Model, also known as the "New Century" or "Triple Lock," and as such would be a valuable piece. There should be a full metal shroud around the ejector rod under the barrel. The "triple lock" name comes from the fact that there is a lockup of the crane/cyinder assembly inside the yoke, as well as at the front of the ejector rod and in the center of the recoil shield. The barrel is probably 6-1/2 inches, measured from the front of the cylinder to the end of the barrel, but other lengths are known. Production was 15,375 units between 1907 and 1915. Pictures would help verify identity and value.