Larry:
No, that number is the serial number. That KERRS PATENT No. 6227 marking really means "KERRS PATENT [REVOLVER. SERIAL] No 6227.]
Colt revolvers have this same marking on the cylinder of all their percussion guns - they all read COLTS PATENT No (then the serial number is here).
The 1227 is a pretty early gun to have the JS ANchor marking on it.
Jeff Anderson