Rolex was able to do this through the use of screw-down 'Millerighe' pushers and larger Oyster crown, in combination with the Daytona case which was already waterproof to 50 meters. Reference 6240 ...

4 x 4 cm. (1.6 x 1.6 in.) ...

Not to be overshadowed, the Rolex Daytona Stainless Steel White Dial Panda, model 116500LN, is cemented in horological lore, and with its characteristic black and white dial, the steel 'Panda ...