Rolex · Explorer and Air-King
Rolex 124270 vs Rolex 126900
3 published specifications differ between these two, and 12 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | ||
|---|---|---|
| Case | Oyster, 36 mm, Oystersteel. Monobloc middle case, screw-down case back and winding crown | Oyster, 40 mm, Oystersteel. Monobloc middle case, screw-down case back and winding crown |
| Diameter | 36 mm | 40 mm |
| Movement notes | Precision −2/+2 sec/day after casing. Centre hour, minute and seconds hands with stop-seconds; no date. Paramagnetic blue Parachrom hairspring with Paraflex shock absorbers. | Precision −2/+2 sec/day after casing. Three hands with stop-seconds; no date complication. |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Water resistance
- Waterproof to 100 metres / 330 feet
- Crystal
- Scratch-resistant sapphire
- Bezel
- Smooth
- Dial
- Black, with highly legible Chromalight display with long-lasting blue luminescence
- Case back
- Screw-down
- Crown
- Screw-down, Twinlock double waterproofness system
- Bracelet
- Oyster, three-piece solid links, Oystersteel
- Clasp
- Folding Oysterlock safety clasp with Easylink 5 mm comfort extension link
- Calibre
- Calibre 3230, Manufacture Rolex
- Movement
- Perpetual, mechanical, self-winding; bidirectional self-winding via Perpetual rotor
- Power reserve
- Approximately 70 hours
- Certification
- Superlative Chronometer (official chronometer certification + Rolex certification after casing)
What the differences cost you
Each note below follows from the published figures in the tables above — what they mean for intake, for a listing, and for the handover. Nothing here estimates a price or a margin.
These reach different buyers
40 mm on the 126900 against 36 mm on the 124270. Diameter is a poor predictor of how a watch actually sits, but it is the field buyers filter on, so the two land in front of different people. Do not let one listing's photographs or copy stand in for the other.
Easy to confuse once they are both in the safe
Only 3 published specifications separate these two — case, diameter and movement notes. Photographs will not reliably tell them apart, so record the reference from the case or the papers at intake rather than from the look of the watch, and check it again before the listing goes up. Getting this wrong is a returned watch and a credibility problem, not a rounding error.
What to check on each
124270
- Put almost all your attention on the case. With no bezel insert, no date and no complication, condition and originality of the steel is most of what distinguishes one example from another.
- Check the crown is the Twinlock system rather than Triplock. This reference uses the two-seal crown, and knowing which you are looking at matters when assessing a case that has been apart.
- Sight along the polished lug chamfers. At 36mm there is little material to lose, and a refinished case shows in softened bevels long before it shows anywhere else.
126900
- Photograph and examine the dial in detail, because on this reference the dial carries essentially all of the identity — the case and movement are shared with plainer models.
- Check the luminous material is consistent in colour and intensity across every marker. Mismatched lume is the clearest sign a dial has been serviced, relumed or swapped.
- Verify there is no date aperture and that the sapphire carries no Cyclops, both of which are correct for this reference.
Sources
- Rolex official product page for reference 124270 (Explorer 36; Oyster 36 mm; Oystersteel) - Model case: Oyster; 36 mm; Oystersteel; Oyster architecture: monobloc middle case; screw-down case back and winding crown; Diameter: 36 mm; Material: Oystersteel; Bezel: smooth; Winding crown: screw-down with Twinlock double waterproofness system; Crystal: scratch-resistant sapphire; Water resistance: waterproof to 100 metres / 330 feet; Movement: perpetual; mechanical; self-winding; Calibre: 3230; Manufacture Rolex; Precision: -2/+2 sec/day after casing; Functions: centre hour; minute and seconds hands; stop-seconds for precise time setting; Oscillator: paramagnetic blue Parachrom hairspring with high-performance Paraflex shock absorbers; Winding: bidirectional self-winding via Perpetual rotor; Power reserve: approximately 70 hours; Bracelet: Oyster; three-piece solid links; Oystersteel; Clasp: folding Oysterlock safety clasp with Easylink 5 mm comfort extension link; Dial: black with highly legible Chromalight display; Certification: Superlative Chronometer — retrieved 2026-09-22
- Rolex official product page for reference 126900 (Air-King; Oyster 40 mm; Oystersteel) - Model case: Oyster; 40 mm; Oystersteel; Oyster architecture: monobloc middle case; screw-down case back and winding crown; Diameter: 40 mm; Material: Oystersteel; Bezel: smooth; Winding crown: screw-down with Twinlock double waterproofness system; Crystal: scratch-resistant sapphire; Water resistance: waterproof to 100 metres / 330 feet; Movement: perpetual; mechanical; self-winding; Calibre: 3230; Manufacture Rolex; Precision: -2/+2 sec/day after casing; Functions: centre hour; minute and seconds hands; stop-seconds for precise time setting; Oscillator: paramagnetic blue Parachrom hairspring with Paraflex shock absorbers; Winding: bidirectional self-winding via Perpetual rotor; Power reserve: approximately 70 hours; Bracelet: Oyster; three-piece solid links; Oystersteel; Clasp: folding Oysterlock safety clasp with Easylink 5 mm comfort extension link; Dial: black with Chromalight display; Certification: Superlative Chronometer — retrieved 2026-09-22
Not affiliated with Rolex. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.