Rolex Sea-Dweller · Reference 126600
Rolex Sea-Dweller 126600
Known as Single Red Sea-Dweller
The 126600 is the reference that took the Sea-Dweller to 43mm and, for the first time in the line's history, put a Cyclops magnifier over the date. Rolex introduced it at Baselworld 2017 to mark 50 years of the Sea-Dweller, which is why the model name sits in a single line of red text on the dial, a callback to the 1967 originals. It replaced the 40mm 116600, a short-lived reference Rolex sold only from 2014 to 2017. Under the caseback you get the caliber 3235, the same generation of movement that runs the modern Submariner Date and Datejust, rated to 1,220 meters of water resistance with the helium escape valve carried over from the tool-diver era. This is the professional saturation diver that still wears like a watch you would actually buy, not a curiosity: bigger than a Submariner, smaller and thinner than a Deepsea, and the only 43mm steel Rolex diver with a date under a Cyclops. We see them across the counter every week on 47th Street, and they remain one of the few current steel sport Rolexes that trades below retail.
Produced: 2017 to present. The 126600 remains a current Rolex catalog reference, sold new alongside the deeper Deepsea line. It replaced the 40mm 116600, which ran only from 2014 to 2017.
In stock at Ultimate Diamond
3 pieces on the counter right now.
Specifications
- Reference
- 126600
- Case Diameter
- 43mm
- Case Material
- Oystersteel (904L stainless steel)
- Case Thickness
- approximately 15mm
- Movement
- Rolex caliber 3235, self-winding mechanical, in-house
- Jewels
- 31 jewels
- Frequency
- 28,800 vibrations per hour (4 Hz)
- Power Reserve
- approximately 70 hours
- Accuracy
- Superlative Chronometer, -2/+2 seconds per day
- Water Resistance
- 1,220 meters / 4,000 feet
- Helium Escape Valve
- Yes, automatic gas escape valve
- Crystal
- Sapphire with Cyclops lens over the date, the first Sea-Dweller with a Cyclops
- Bezel
- 60-minute graduated unidirectional rotatable bezel, black Cerachrom ceramic insert
- Dial
- Black dial with Chromalight display, red single-line 'Sea-Dweller' text
- Bracelet
- Oystersteel Oyster bracelet, 22mm lug width
- Clasp
- Oysterlock safety clasp with Rolex Glidelock extension and Fliplock diving extension
- Year Introduced
- 2017
Market & Value
This is one of the rare current steel Rolex sport watches that has spent most of its life trading under sticker. As of mid-2026 the US list price sits around $14,550, and clean pre-owned examples change hands roughly in the $11,000 to $12,500 range, call it low double digits below retail depending on year, box, papers, and condition. That gap is the opposite of the Submariner and GMT story, and it exists because the 43mm case and the added Cyclops split the collector base: buyers who want a no-date, no-Cyclops purist diver step down to a Submariner or a vintage Sea-Dweller, and buyers who want maximum depth step up to the Deepsea. That soft demand is good news if you are buying. Full set with box and card commands the top of the range; a naked head trades noticeably softer. When we write a check on one, condition of the bracelet stretch, the ceramic bezel edges, and the presence of the original card drive the number more than model year.
What to Know Before You Buy
Three things separate the 126600 from every Sea-Dweller before it. First, the size: 43mm and roughly 15mm thick, on a 22mm Oyster bracelet, so it wears larger than a 41mm Submariner and needs a wrist that can carry it. Second, the Cyclops: purists who loved the flat, clean Sea-Dweller crystal will either accept it or move on, and that debate is baked into resale. Third, the movement: the caliber 3235 brought the 70-hour power reserve and the Chronovergence escapement, a real step up from the 3135 in the outgoing 116600. If you are shopping, the single-line red 'Sea-Dweller' text is standard on this reference and is not a rarity premium; do not pay a story tax for it. Check that the Glidelock and Fliplock extension work smoothly, confirm the caseback and lug engravings are crisp, and insist on the warranty card for the strongest resale. Because it is still in production, service and parts are current, which protects the buy price. Watch out for polished cases that have lost their sharp lug lines, that is where value quietly walks out the door.
Rolex Rolex Sea-Dweller & Deepsea Encyclopedia
Read the full guide →Buying or selling a 126600?
Ultimate Watch buys and sells the Sea-Dweller 126600 on 47th Street. We are at 19 W 47th Street in New York, family-owned since 1959, and we write checks on these every week, so we can quote you a real buy number the same day, not a chart printout. If you are selling, bring the watch in with the box and card if you have them and we will make you a firm cash offer on the spot. If you are buying, tell us the year and condition you want and we will source a clean example. Call us or request an offer to get started.