You'll need to provide more information for the experts to make that determination;
and pictures would be nice too.
Based on the "1879" date you mention (which should be October 7th, 1879), and the caliber (22 LONG R.), I suspect that you have a Model 1885 Single Shot rifle(falling block action).
The serial number (on the lower tang behind the lever) will tell me exactly when it was manufactured.
In order to properly assess the graded condition and specific variation, I will need to see several clear close-up pictures of it.