Hello my fellow silver stackers! I bought this bar many years ago and can't seem to find out exactly what it is. Some variations online have it at 4 ounces and 6 ounces, I do not have my scale so cannot weigh it at the moment. It measures 2 1/2" x 6", proof like a mirror. I'm trying to find out: -Is it silver? -How many OZT? -Where can I look up the serial number on reverse online? Any help much appreciated, thanks!