Thread: G grade 12 garage markings
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Unread 02-04-2023, 11:41 AM   #9
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There are several guesses as to the HT over A -- Heat Treated Annealed -- High Tensile Alloy -- etc. I have no idea what the 55 means, but I have a gun with a 153 in that area, and have recorded several guns with a one-, two- or three-digit number in that area.

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