Model 1842 ASTON Military single shot pistol

Model 1842 ASTON Military single shot pistol. Flayderman P. 333, item  6A 041. Dated 1851. Lockplate and barrel are correctly dated, strong military inspectormarks on the left side of the stock. 
Barrel is showing some brown spots but will clean easily, stock is outstanding, no splits, works fine, completely original and mechanical 100 %.  Approx 6000 made. the lockplate is showing medium pitting.