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That "3" stamp is the frame size. I dont know what the "6" is, but it is in the wrong place and turned the wrong way to be the frame size. Measuring the firing pin spacing will confirm since there is a big difference between a 3 and a 6.
Besides, with all the metal that would be in a set of 6 frame 10g barrels, the gun would have to weight at least 14 lbs.
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