Certina - The 1969 Certina DS-2 Super PH 500M was an integral part of the Tektite underwater experiment, in which four scientists lived in underwater tanks under NASA supervision for two months. #
Certina DS Super PH500M for $1,134 for sale from a Trusted Seller on Chrono24
Certina DS2 Super PH500 help needed | Omega Forums
Certina DS-2 Vintage DS-2 SUPER PH 500M Ref-5801-123/I Stainless Steel Papers 1968 UNPOLISHED | Watch Rapport
Certina DS-2 Super PH 500M Diver's circa 1960's
SCUBAWATCH.ORG CERTINA DS-2 SUPER PH500M
Collectors Market - FS: Other Certina DS-2 Super PH500M
Certina DS Super PH500M Review - The Dive Watch Connection
Certina Dive Watches - VintageCERTINAs
Certina DS Super PH500M Orange Dial – HODINKEE Shop
Certina DS PH500M has complex features that other luxury divers don't! - YouTube