The T with the quarter moon marks above and below are the barrel material mark for Twist. Twist barrels were used on the entry-level, Grade 0, hammer guns. Grade 0 guns were cataloged in four qualities -- Quality R was a 10-gauge with a pistol grip stock List Price $60, Quality S was a 10-gauge with a straight grip List Price $55, Quality T was a 12-gauge or smaller with a pistol grip stock List Price $55 and a Quality U was a 12-gauge or smaller with a straight grip List Price $50.
The 1 on the barrel lug indicates a frame size of 1 which indicates a firing pin center-to-center spacing of 1 1/16-inch.
The weight stamp of 3 pounds 13 ounces of the rough barrel set before fitting and finishing. Helped the worker pick a set to get to the finished weight of the gun he was working towards.
The small C on the right barrel flat is a mark found on most Parker Bros. Twist and Damascus barrels. The meaning of that C and the small A on the left barrel flat have been lost to the sands of time.
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