A very scarce variant of the Keystone Watch company dust proof movement that is a 10 jewel movement. Movement is in good running order and seems to keep time but I have not checked it over a long period. Has good motion. Serial number 323564 circa 1886 making this watch about 140 years old. I believe the 10 J come out of a run quantity of 2000 and is a scarce varient and has the stone window over the balance. Great Bitner patented regulator. Dial is the original glass enamel Keystone dial and looks to be mint to near mint condition. Very nice hands. Case is a high grade Metropolitan standard case with the three Acorn trademark. This case is a very heavy 14 karat gold filled case that was marketed as and equivalent to a low karat gold case, but is actually a high quality gold filled case. Case has some light wear but very nice detailed engraving and no brass showing except possibly a little bit on the bow area. Very nice original beaded Bezel, Watch winds and sets well, a stunningly beautiful hunting case pocket watch that is a Scarce model in its original great looking case. A very Collectable 18 size pocket watch. Please see pictures for more information than Condition. So as it was.was.