Marston single shot single action percussion pistol

Marston single shot single action percussion pistol. Flayderman P 397, item 7C 025 

This is a rare one. 

6 inch barrel, sharp THE WASHINGTON ARMS CO, half round, half octagon barrel. little bit blue left . Grips are fine, no damage,  Barrel has number x 3, under grips serial 250. Works perfect a nd 100 % original.