I took some pictures with my phone but could not send them to my computer so I will try and ask for some help on identifying this Model 100 20 ga. 32" single barrel that has no name and only has a few markings. Serial number 68818. Marking on barrel water table has three broken circles with an H in it. Below that is a tulip with BP in the center and below the stem FC. Below that is 75mm which is close to 3" and is the chamber length.
Funny thing is a 20 shells will go in and stop at the head piece of a Remington hull. I miked the chamber mouth at .691 and the Remington miked .698 at the head. The chamber tapered and 2" in was .678 which is ok the hull went in that far 2 3/4" hull. The muzzle end miked at .593 which I believe is typical for a 20 ga.
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