Seiko 6309 Diver -1981 Travel Rolex had solved the issue

Rolex had solved the issue and the Day-Date was deemed accurate enough to be stamped "Superlative Chronometer Officially Certified" - denoting the COSC standard of -4/+6 seconds per day rate

They worked out great for warm water divers

the very beginnings of SCUBA diving as a sport

Name isn't everything

We will update the listing regularly with the current high bid

Seiko 6309 Diver -1981 Travel Rolex had solved the issueIf we had to chose only one vintage Seiko diver, this one would be it. The 6309 series diver replaced Seiko's 6105 in 1976 and remained in production for more than a decade. While similar to the 6105 in many ways, the 6309 departed from its predecessor's asymmetrical case design, instead utilizing a hefty 45mm symmetrical cushion or "turtle" case. The 6309 also added a day function to the 6105's simple date window and a revamped dial with circular