Seiko Watch Prospex The 1978 Saturation Divers Limited Edition S23626J1. To commemorate the 40th anniversary of Seikos invention of the worlds first professional quartz divers watch, this landmark timepiece is faithfully re created in design but re invented with Seikos latest technology and materials. The case construction and dial layout are loyal to the original, as are the unique hour markers and the crown, while the water resistance has been increased to 1000m.