ROLEX BIG BUBBLEBACK REF. 5026, CIRCA 1958 Two body tonneau Oyster stainless steel case, n. 443371, slopped bezel, concave lugs, screw back stamped 5026, Twinlock crown. Steel Rolex Oyster bracelet 7205 with riveted links, deployant clasp marked 2.69, end-links 57.
Silvered dial signed, bâton and Arabic numerals indexes, minute division on one rail, sunk subsidiary seconds dial with inscription "Officially Certified Chronometer”. Gilt feuille hands.
Signed self-winding movement, nickel-plated caliber 720, n. G67642, 18 jewels, lever escapement, Superbalance adjusted to six positions, blued Breguet hairspring, micrometer regulation. 
Diameter Ø: 36 mm
Note: working; glass with hairline.