A gentleman's gold mid-size automatic calendar wristwatch, Model: Oyster Perpetual Datejust, Ref:6827, circa 1980,

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A gentleman's gold mid-size automatic calendar wristwatch, Model: Oyster Perpetual Datejust, Ref:6827, circa 1980,
18k, blue dial signed Rolex Oyster Perpetual Datejust, Superlative Chronometer Officially Certified, gilt baton markers, date aperture beneath magnifying glass, sweep centre seconds, plastic crystal, self-winding movement, case with faceted bezel, screw down winding crown, screw back with faint inscription, 18k. President bracelet with concealed deployant clasp, 30mm.