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Description
ARF Rolex DateJust 31mm Ref. 278383RBR
A precisely executed mid-size reference that prioritizes structural finishing and reliable mechanical performance over superficial movement cloning.
Powered by ETA 2688
Rather than employing an unproven small-diameter clone movement, ARF equips this 31mm reference with the established ETA 2688 architecture. This decision significantly reduces the failure rate commonly associated with mid-size replica calibers. The movement operates at a steady 28,800 vibrations per hour, ensuring a smooth sweep of the seconds hand. It features a reliable instantaneous date complication that aligns correctly within the dial aperture.
Regulated to approximately 卤10��15 seconds per day out of the box, with positional variance typical of standard ETA architectures.
- �� Power Reserve: Approximately 36 hours
- �� Complications: Centre hour, minute, seconds; instantaneous date with rapid setting
- �� Winding Direction: Bidirectional automatic winding
Technical Specifications
The 31mm monobloc middle case features correct lug tapering and polished flanks, maintaining the elegant profile of the mid-size DateJust without excessive thickness.
Exhibits a dynamic Grey radial finish. The synthetic diamond markers are set in correct 18k-plated chatons, showing appropriate depth and crisp coronet printing.
The fixed bezel is set with synthetic stones that mimic the dispersion of the genuine article, housed in an 18k yellow gold plated framework.
Five-piece links with brushed steel outer links and polished gold-plated center links, secured by a well-toleranced folding Oysterclasp.
Why ARF for This Reference?
Many collectors ask: ��Why not GMF?��
While GMF produces a wide array of 31mm models, ARF consistently delivers superior bracelet finishing and tighter end-link tolerances. The Jubilee bracelet on the ARF version exhibits less lateral play, and the 904L steel base provides a slightly brighter luster that better complements the gold plating.
Full Disclosure: The 18k yellow gold plating on the center links is a surface treatment; while visually accurate initially, it lacks the mass of solid gold and requires care to prevent premature wear from abrasive surfaces.
Data Sheet
| MODEL REFERENCE | m278383rbr-0022 |
| FACTORY / VERSION | ARF Edition |
| MOVEMENT | ETA 2688 |
| CASE MATERIAL | 904L Oystersteel (18k Gold Plated) |
| WEIGHT & THICKNESS | [unconfirmed] | ~10.6mm |
| CRYSTAL & LUME | Sapphire with Cyclops | Chromalight |
| DIMENSIONS | 31.0mm � 37.0mm � 10.6mmManual measurements �� minor tolerances apply. |
| WATER RESISTANCE | 50 Meters �� professional pressure test recommended before swimming |
Collector Q&A
Q: Does the ETA 2688 movement function exactly like the genuine caliber 2236?
A: The ETA 2688 is a robust alternative used in the 31mm case. While it lacks the Syloxi hairspring and specific 55-hour power reserve of the genuine 2236, it provides reliable timekeeping, instantaneous date changes, and allows for correct hand-stack heights.
Q: How accurate is the grey dial color and diamond setting on this ARF version?
A: ARF has achieved a highly accurate sunburst grey tone. The synthetic diamond markers are set with correct prong alignment and depth, avoiding the crooked settings often seen in lower-tier mid-size replicas.
Q: Will the gold plating on the two-tone Jubilee bracelet fade quickly?
A: The 18k yellow gold plating is applied via PVD, offering reasonable durability for daily wear. However, it is a surface treatment; harsh chemicals or abrasive polishing will eventually expose the steel base over time.
Q: What is the main drawback of this ARF DateJust 31 compared to genuine?
A: The primary tell lies in the overall weight. Because the genuine 278383RBR utilizes solid 18k yellow gold for the bezel and center links, the ARF replica��which uses plated Oystersteel��feels noticeably lighter in the hand.
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