In my previous note, I forgot to ask where you determined that this is a 12 gauge. I see 13 and 15 stamped on the underside of the barrels, but that's odd, too. I would not be too surprised at an 11, a 12, a 13, a 14, a 15, or a 16 gauge gun from this era. But I am frankly confused by two different numbers under the barrels. Some expert will probably tell me those numbers mean something different, and that's okay with me. I will learn something new if that happens.