STEEL AND GOLD ROLEX REF. 6618, CIRCA 1961 Three body tonneau Oyster stainless steel case, n. 873392, slopped gold bezel, concave lugs, screw back reference 6517 (strikethrough) and 6610, marked II.61, Twinlock crown. Rolex Oyster steel and gold bracelet with end-link stamped 66, deployant clasp marked 4.62. 
Signed champagne dial with soleil finishing, crown logo at 12, applied arrow indexes side by side with tritium dots. Luminous alpha hands and centered seconds.
Signed self-winding movement, rhodium-plated caliber 1130, n. 34294, 26 jewels, lever escapement, monometallic balance with screws adjusted to five positions and temperature, flat hairspring, KIF shock-absorber.
Diameter Ø: 25 mm
Note: working.