I do know that the gun was brought to America in 1873 by John Rogers (my great, great, great grandfather). He arrived in America and purchased a tract of 560 acres in June of 1873. I believe that narrows it down to 1870-1873 for manufacture. Is there a source that may have a ledger book or serial number record? The serial number on the gun is 4228.

Thanks for all the replies on this so far. As my user name suggests I collect Pre-13 L.C. Smiths. However when it comes to British guns I am very uneducated.