Rolex Oyster Perpetual Date, reference 1530, “Oyster 50th Anniversary” edition. Launched in 1976 to commemorate the 50th anniversary of the iconic Rolex Oyster case (1926–1976), this rare stainless steel model features a distinctive angular case and integrated bracelet originally tooled for the forthcoming Oysterquartz line. Fitted instead with the reliable automatic Calibre 1570 while quartz development continued, only around 1,500 examples were produced between 1975 and 1977, making it one of Rolex’s shortest and most collectible runs of the era. This exceptional piece, sold in January 1981, retains excellent condition and comes complete with its original 50th anniversary presentation box (1926–1976 branding), guarantee, tag, and accessories — a true highlight for connoisseurs of vintage Rolex innovation and rarity.