Integral, the numbers are stamped on the inside surface. It would consist of the last two digits "04" of the serial number and maybe also an inspection stamp. The inspection may be small and faint. In your case it would be an eagle-over-655, the same as the inspection marks on the receiver. The right side grip is much stronger than the left grip, with fewer obstructions to get around. I would recommend that if you want to check the grips, remove the right side and examine it. In many cases if you drop the magazine, you can see the back side of the left grip through the frame well enough to spot any numbers present. Good Luck !!!
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