This is a very nice split seconds chronograph pocket watch movement. Made for Marcus & Co. It comes with original crown and stem. Also the button with screw to operate the split second hand. Not sure who made it. The usual suspects might be CH Meylan, Agassiz, Audemars and a few others. Doesn't seem to fit in a serial no. range for Patek. Beautifully polished steel parts and the lever and escape wheel have cap jewels. The split portion of the chronograph is under the dial. Dial ...diameter approx. 38.90mm. Open Face configuration. Lever set. Condition:DIAL WITH SOME HAIRLINES AND CHIPS. THE WATCH WINDS, SETS AND TICKS. THE CHRONOGRAPH OPERATES CORRECTLY THOUGH A BIT STIFF TO OPERATE AT CROWN (though I think this is partially because it is not cased). MAY NEED A CLEAN/OIL. FREE USA SHIPPING!