In 1956, the Oyster Perpetual Day-Date made its debut. Available only in 18 ct gold or platinum, it was the first wristwatch to display the date and day of the week spelt out in full in a window on the dial. With the President bracelet, originally created specially for it, the Day-Date continues to be the watch par excellence of influential people.
| Movement | Winding |
| Mechanical | Bidirectional, Automatic |
| Functions | Calibre |
| Centre hour, minute and seconds hands. Instantaneous date with rapid setting. Stop-seconds for precise time setting | 3155 Calibre, Manufactured by Rolex |
| Water-Resistance | Oyster Architecture |
| Waterproof to 100 metres / 330 feet | Monobloc middle case, screw-down case back and winding crown |
![ACR C-Strobe H20 [3964.1]](https://www.wristgemz.shop/image/acr-c-strobe-h20-39641_tsvI7v_300x.webp "ACR C-Strobe H20 [3964.1]")
