T is not a grade, it is a quality. The P is stamped on the water tables. The hats top and bottom on the T indicate a plain twist barrel if I remember correctly. I too believe the barrel weight is much too light for a 10 gauge, as is the overall gun length. A 26" 10 would be a real oddity. Since this is obviously not a hammer gun, my best guess is that there was an error in the work orders and the gun was a hammerless 12 ga. Just my guess. I would also tell you that 26" barrels would be not common in a 12 and even less common in 10. If I were buying the gun, I would presume that it was a 28" or 30" 12 ga with light barrels that was cut off to 26".
Also, try the obvious. If any place has a shell, it will have a 12 g. Buy or borrow one and see if the 12 ga fits tigntly in the chamber. I would bet it will.
It is a pretty nice example. However, if the barrels are cut, it's value is greatly diminished, from both a collector or user point. Post a picture of the top of the rib around the bead and the front of the muzzles.Many people here will be able to make a judgement from that.
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