There are factory records that record frame sizes. The later stock books have a column for frame size. I don't know when this started, but it is probably beyond the #6 frame era. The Puglisi #6 frame 12 gauge is the first gun I saw other than an eight gauge that was made on the #6 frame. My ten gauge #6 frame Vulcan Steel gun was not made as a ten gauge. It was made as an eight gauge and sent back to Parker Brothers to be rebarrelled in ten gauge. I never saw a letter on the Puglisi gun.
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