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The other markings were put on with a roll stamp, the receiver being rolled against a cylindrical stamp, but the serial number was put on using a jig and individual number stamps. The workmen charged with that job prided themselves on getting the number centered, so any addition or deletion at either end shows up plainly. One case is that of single heat treat rifles to which someone added a "1" at the front of the serial number to make them easier to sell.
Jim
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