beneath the extractor star on the back of the cylinder is a series of numbers that appear to be randomly stamped. the gun is a 1975 model 57. i do not see these numbers on my other guns, any thoughts?

How do they compare to your serial number?

Sometimes they are on the star, sometimes on the cylinder.

they do not match the serial number.

I have a couple of Model 29s that are stamped similarly. I believe the numbers were stamped during the manufacturing process to aid in assembly or inspection. I know these are not assembly numbers, but were put there by a technician working on a particular gun (for his specific purpose).

Bill

thanks bill, i've never noticed them before.