ROLEX. A RARE AND INCREDIBLY WELL-PRESERVED MEN'S SILVER MANUAL VINTAGE WRISTWATCH Model: Cushion Oyster Case reference: 2883 Date: Circa late 1920’s Movement: Signed, Prima movement, 15-Jewels, timed 6 positions for all climates, swiss made Dial: Signed, silvered guilloche sunburst dial, black Roman numerals, black outer minute division, subsidiary dial for seconds at the 6 o’clock position, blued gothic hands Case, Signed Oyster patent, silver cushion, early onion crown, silver knurled bezel, silver screw down back, stamped 20 world records, Great Britain patents 260554/1925, 274.789, Swiss Patents 114.948 and 120.851, signed R.W.C Ltd. hallmarked Glasgow 1928 Strap: Black generic lizard , Rolex buckle Size: 32mm by 32mm 1926 was a pivotal year in the history of watch-making thanks to the creation of one of the most iconic watch models: the Cushion Oyster. In that year, Wilsdorf arranged for C.R. Spillman SA to acquire the patent of a screw-down back ( to see a watch with this case, please refer to lot 69 and 73 in this sale) , which had been patented earlier that year by Paul Perregaux and George Perret. The screw-down back consisted in having the bezel and back case tightly screwed together into the main case against soft lead seals. After a decade of experimentation, the first real hermetic and water-resistant watch was born and it was presented in an octagonal and a cushion-shaped case 28mm for ladies and 32mm for men. Since then, the model's design has barely changed proving its efficiency over a period of almost 100 years.