Richmond Lock Plates come in a number of different types.

Type1: Would be the high hump lock plates that were stamped 1861 to the left of the hammer and Richmond, Va to the right side. These Richmonds were made before the Armory was transferred to the Confederate Government and were not stamped with the C.S. over the Richmond, Va. Unfortunately I do not have an example of this type of lock plate.

Type 2: Were similar too type 1( high humps) except they would be stamped with C.S. over Richmond, Va. indicating they were weapons that were made after the Armory was transferred to the Confederate Government.

Type 3: Lock plates were lock plates (high humps) that the hump on the plate was either cut or grinded down to allow the user to quickly insert and remove the primer, since the hump usually got in the way, slowing down the loading time of even the best foot soldier.

Type 4: Lock plates that used retooled dies and reconfigured the high hump design lock plate to what most call a low hump. These plates measure approximately 1 5/8″  from the top of the hump area of the lock plate to the bottom of the plate. This alteration was the design of William Wentzel, starting in about April of 1862 throughout the course of the war.