Sounds like a reamed out 12. It is my understanding that the 11 gauge guns were in the very early serial numbers. I believe the # and year are to late for it to be a true 11 bore gun.
My grade two top lever 12 has .750 bores as well. It was clearly reamed to remove some pitting. But fortunately they left the chambers alone. Minimum wall thickness now is 49 thousandths.
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