The estimates are far beyond, light years beyond, my budget.
In the write up of the rifle on the Contemporary Makers site, it is speculated that the "IP" on the British bayonet is, guess who, Joseph Perkin.
Were you to add up all the muskets, rifles, bayonets, etc marked "IP" that are attributed to Joseph Perkin, the total would boggle the mind. Actually the stamp is "IR".