Audemars Piguet, a gentleman's 18ct gold 'Royal Oak' wristwatch, no. 96, circa 1978, the circular

Audemars Piguet, a gentleman's 18ct gold 'Royal Oak' wristwatch, no. 96, circa 1978, the circular grey dial with a grid pattern and date wheel aperture, within an octagonal bezel decorated with screw motifs, to a case and integrated bracelet with a deployant clasp in brushed gold, case width 3.9cm excluding winder, signed Audemars Piguet Royal Oak, numbered No. 96, ref 5402BA, inscription dated 1978, automatic movement, Swiss assay marks for 18ct gold, case and one spare link with Audemars Piguet letter dated 1978