ROLEX REF. 16550 EXPLORER II IVORY DIAL STEEL
Rolex, Oyster Perpetual Date, "Explorer II," Superlative Chronometer,
Officially Certified, case No. 9720317, Ref. 16550. Made in 1987.
Fine, two time zone, center seconds, self-winding, water-resistant,
stainless steel wristwatch with date, 24-hour bezel and hand,
independently adjustable 12-hour hand and a stainless steel Rolex
Oysterlock bracelet with deployant clasp. Accompanied by a service
Three-body, polished and brushed, screwed-down case back
and crown, graduated 24-hour bezel for the second time zone,
Twinlock winding crown protected by the crown guard, sapphire
crystal with cyclops lens.
Ivory-color with applied luminous round, triangular and baton
steel indexes, aperture for the date. Luminous steel skeleton hands.
Cal. 3085, rhodium-plated, 27 jewels, straight-line lever escapement,
monometallic balance adjusted to temperatures and 5
positions, shock absorber, self-compensating free-sprung Breguet
balance spring, Microstella regulating screws, hack mechanism.