GOLD BAUME & MERCIER REF. 3921 WITH CHRONOGRAPH, 50S Three body circular 18K gold case, n. 50794, slopped bezel, concave lugs, snap on back, rectangular pushers. Not original strap and buckle.
Silvered dial signed, applied rhomboidal and Arabic indexes, minute and 1/5th of second divisions, subsidiary dials for seconds and 30-min register, outer tachymetric scale. Gilt alpha hands.
Signed manual winding movement, nickel-finished caliber Landeron 148, 17 jewels, lever system for the chronograph, lever escapement, monometallic balance with screws, flat hairspring.
Diameter Ø: 36 mm 
Note: working, but a servicing is suggested.