Before the invention of the percussion cap in 1822, there was a variety of detonating material that was used. This example used a drum to dispense a single pellet, which was then detonated by the hammer. The lock plates were reengraved with "FORSYTH & Co/PATENT" and they feature scroll engraving at the rear and as stated are fitted with self primers ahead of the hammers. The scrollwork extends to the hammers. The twist barrels have a solid rib which has also been reengraved and gold inlaid with the name "FORSYTH & Co LONDON". The rib is fitted with a silver blade front sight. Each barrel bolster has been reengraved, two inlaid gold bands one at the front and rear of each bolster. The trigger guard has a pineapple finial. The half stock has a checkered wrist, single barrel wedge, pineapple forend insert, silver thumb escutcheon, cheekpiece and flat buttplate. Length of pull is 13 7/8 inches. Alexander John Forsyth (1768-1843) was a Scottish Presbyterian clergyman who is best known for inventing the roller primer percussion system and manufactured hunting arms for nearly 20 years.