I checked the serialization book and it had no record of your gun. This was common for the O grade guns. They were for some reason excluded from the data (not all guns have existing data anyway). I checked as to factory records (see the home page) and there does appear to be some sort of records available for your gun, so I too would advise obtaining a factory record.
You asked about the back action dates and they were pretty much pre-1874. I own one and there is no mistaking them; thay look nothing like the later locks. Yours is not. It is also, as Edgar stated. likely a 0 grade. From appearances it has seen a long hard life. One thing not mentioned is the barrel steel. At this date it would be either Damascus or Twist of some form (possibly Laminated). The barrel rib extension should designate the type of steel.
You haven't asked about value but are talking around the point. Heirloom guns often have a draw to the family but the marketplace doesn't pay attention to that. If the gun you have is on face and the inside of the barrels are not severely pitted, my opinion is thatvit would likely sell for something under $1000. If it is loose and/or the barrels are pitted, it would be a sold as essentially a decorator piece. You need to be realistic if you decide to part with it.
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