Another innovation is the improvement of the waterproofness by screw down pushers which will facilitate the industrial production of watches for the use of deep sea diving.
Launched in 1969 the 6263 type is most often assembled with pre-existing case backs of 6239 type. The design is not immediately stabilized and tiny differences of inscriptions or colors are considered now by collectors among the rarest sub-variants of the brand. The rest of this discussion refers solely to 6263 Oyster Cosmograph Daytona Paul Newman wristwatches built in 1969.
A stainless steel watch of the sub variant named Sotto due to the unusual position of its inscriptions on the dial was sold for CHF 2M including premium by Phillips on May 14, 2016 over a lower estimate of CHF 750K. Named RCO for another inscription variant, a 6263 was sold for CHF 990K including premium by Christie's on November 10, 2013.
The "lemon" and the "tropical panda" are two other variants of the dial. A Tropical Panda was sold for CHF 930K including premium by Phillips on May 14, 2016.
On May 15 in Geneva, Christie's sells a previously unknown stainless steel Sotto, lot 223 estimated CHF 450K.
On May 14 in Geneva, Phillips sells two watches also belonging to the above categories. Lot 235, estimated CHF 350K, is in stainless steel. It is illustrated in the second tweet below. Lot 237, estimated CHF 800K, is one of the rarest variants : a very elegant yellow gold 6263 watch with lemon dial and screw down pushers.
Phillips lot 235 : SOLD for CHF 550K including premium
Phillips lot 237 : SOLD for CHF 3.7M including premium
Christie's : unsold