Those are called Pattern 1809 ( Indian Type 2) there were a very large number of these made , then the precusion jobbies gets very hairy trying to ID real guns from modified surplus by other nations .There are other Ordnance flintlock muskets that come after the Type2 and these were on issue up to and including the Afghan war .It has come to light recently that large numbers of surplus India patterns were purchased by other Nations and converted to percusion and modified in other ways to meet their needs .