No it is on the front facing the end of the barrel. Some were not stamped very well or like my 1950 EG it just had a diamond. I had to remove the butt stock to find the stamped code of 12B on the right hand side of the metal under the stock. Here is a picture of a LBC
If it is stamped lightly, hold a piece of paper over the stamping and use something like chalk, a pencil, or even a crayon. Rub lightly horizontally, the stamp should show up on the paper like MAGIC. Worth a shot.
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