Rolex · Explorer
Rolex Explorer 124270: specifications and what to check
Thirty-six millimetres, a smooth bezel, no date and a Twinlock rather than Triplock crown. The simplest steel Rolex, which makes case condition almost the entire conversation.
Reference 124270 · specifications read from the manufacturer on 2026-09-22 · listed as current
Specifications
As published by Rolex. A field the manufacturer does not state is left out rather than filled in.
- Case
- Oyster, 36 mm, Oystersteel. Monobloc middle case, screw-down case back and winding crown
- Diameter
- 36 mm
- 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
Movement
- Calibre
- Calibre 3230, Manufacture Rolex
- Type
- 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)
- 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.
What to check before you buy
- 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.
- Confirm the movement is the 3230 with its seventy hours, not an earlier calibre from a previous generation of this case.
- Verify the dial genuinely has no date aperture and that the Cyclops-free crystal is correct and unmarked — this reference is date-free by specification.
Nothing to hide behind
This is the plainest watch Rolex makes in steel: 36mm, a smooth bezel, no date, three hands and a stop-seconds function. There is no ceramic insert to assess, no complication to test, and no bracelet variant to identify.
That simplicity changes how you buy one. On a Submariner, a dozen separate components each carry information about the watch's history. Here, almost all of it lives in the case — its proportions, its edges, and whether anybody has taken a polishing wheel to it.
Why a small case punishes polishing
At 36mm the lugs are short and the chamfers are fine. There is very little metal between a correct case and a rounded one, and a single enthusiastic refinish removes more of it proportionally than the same work would on a 41mm watch.
Hold it under a raking light and sight down the length of each lug. You are looking for a crisp, continuous bevel that runs the full length and meets the case flank at a defined line. Softness, waviness, or a bevel that fades in and out is the tell — and it is permanent.
This is the single most valuable skill to develop on this reference, because it is the main thing separating two examples that photograph identically.
Twinlock, not Triplock
A small but genuine distinction. This reference uses the Twinlock double waterproofness system on its crown, where the dive references use Triplock's three seals. Both screw down; they are not the same component.
It matters when you are assessing a watch that has been serviced. Knowing which system the reference is specified with tells you what should be in the case, and it feeds directly into the 100 metre rating this watch carries rather than the 300 of a Submariner.
The date-free specification
No date aperture, and therefore no Cyclops on the crystal. Obvious in the hand, and worth confirming against the reference when you are working from photographs, because Rolex's catalogue contains a great many similar-looking steel watches that do carry one.
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Sources
Not affiliated with Rolex. Specifications are read from the manufacturer's own published documentation on the date shown and may change; the manufacturer's current documentation governs.