Editorial
The Sea-Dweller 126600 is a 43mm professional dive watch built for saturation diving, rated to 1220 meters and fitted with a helium escape valve for decompression chamber use. Introduced in 2017 as the 50th anniversary model, it brought the Cyclops lens back to the Sea-Dweller line after decades of absence, which remains its most debated design choice among serious collectors.
The 126600 launched in 2017 to mark fifty years since the original Sea-Dweller, replacing the 116600 (2014-2017) with a larger 43mm case, a ceramic bezel insert, and the new caliber 3235. The anniversary text "1967-2017" on early production dials was dropped within a few years as the reference moved into standard production. The caliber 3235 brought a Chronergy escapement and a 70-hour power reserve, a meaningful upgrade over the 3135 it replaced.
The Oysterlock clasp replaced the Glidelock of the 116600, a small but noted regression for divers who valued fine depth adjustment at the wrist.
Check the dial text: early production examples carry the "1967-2017" anniversary inscription and are distinguishable from later standard-production pieces; neither commands a reliable premium yet, but knowing which you have matters for accuracy. The ceramic bezel insert should show consistent color depth; aftermarket inserts exist and are worth scrutinizing under good light. The 43mm case wears large on smaller wrists and is frequently returned to service with over-polished lugs, so check the chamfer sharpness before buying.
Confirm the Oysterlock clasp is original and functioning correctly; a replaced or repaired clasp should be disclosed. Prefer examples with the original bracelet, as aftermarket steel bracelets are common and depress value.
