Rolex "Oyster Perpetual Datejust Chronometer - officially certified", Movement No. D006377, Ref. 1601, Cal. 1570, 35 mm, circa 1966

A gentleman's fine automatic wristwatch with date and original box
Case: steel/gold, screw back ref. 1601, "I/66", reeded gold bezel, screwed "Twinlock" winding crown. Dial: gilt, applied indexes, centre seconds, date indicator, gold baton hands. Movm.: rotorwind movement, rhodium-plated, ground, 6 adj., 26 jewels, Glucydur screw balance, incabloc shock protection for balance.