This gun was made by Benjamin Mills of Lexington, Kentucky, probably in the 1870's.  Benjamin Mills was a very accomplished gunsmith and served as the Master Armorer at Harper's Ferry Arsenal before the Civil War.  As a matter of fact, he was among those taken prisoner by John Brown when he attempted to take over the arsenal.  This gun has a 25 inch barrel with a 44 3/4" overall length.  It appears to fire a .36 caliber center fire cartridge.  The trap door mechanism is fairly intricate but still seems to function well.  The top of the breech block is marked "B MILLS & SON, LEXINGTON, KY."  The gun is overall a smooth brown patina, with moderate wear to an otherwise solid stock.  It is a rare example of Benjamin Mills' ingenuity and craftsmanship.  Price $3,250.  REDUCED $2,250!  SOLD!!