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Description
ARF Rolex Datejust 31 Ref. 278278-0010 President
A technically sound mid-size mechanical alternative characterized by strict bracelet tolerances and a reliable clone 2236 caliber.
Powered by the Clone 2236 Caliber
The mechanical core of this replica is the Clone 2236 self-winding movement, specifically engineered to fit the smaller 31mm Oyster case architecture. It utilizes a bidirectional winding rotor and features a functional stop-seconds mechanism for precise time setting. The instantaneous date complication clicks over sharply at midnight, aided by a rapid-setting function controlled via the second crown position. To ensure optimal performance, every piece undergoes prior to dispatch.
The Clone 2236 movement is typically regulated to perform within 卤10��15 seconds per day, depending on resting position and mainspring tension.
- �� Power Reserve: Approximately 36 hours
- �� Complications: Centre hour, minute and seconds hands; instantaneous date
- �� Winding Direction: Bidirectional
Technical Specifications
Measuring 31mm in diameter and 10.2mm thick, the case mimics the authentic monobloc middle case design with a screw-down case back.
Features applied Roman numerals with sharp pad printing for the coronet and dial text, providing high contrast against the sunray-finish green backdrop.
The signature fluted bezel is meticulously machined to catch and reflect light, coated in 18k yellow gold plating to match the case.
Three-piece semi-circular links finished with alternating brushed and polished surfaces, secured by a concealed folding Crownclasp.
Why ARF for This Reference?
Many collectors ask: ��Why not GMF or WF?��
ARF is selected for this specific 31mm Datejust primarily due to its superior bracelet construction. The President bracelet on the ARF exhibits significantly tighter end-link tolerances and less lateral play compared to GMF variants, resulting in a more rigid and authentic feel on the wrist.
Full Disclosure: The 18k yellow gold plating tone is slightly warmer than genuine Rolex 18k alloy, and at 80 grams, the watch is noticeably lighter than the solid gold authentic piece.
LIVE PREVIEW
Data Sheet
| MODEL REFERENCE | Datejust 31 m278278-0010 |
| FACTORY / VERSION | ARF Edition |
| MOVEMENT | Clone 2236 Auto |
| CASE MATERIAL | 904L Oystersteel (18k Gold Plated) |
| WEIGHT & THICKNESS | 80g | 10.2mm |
| CRYSTAL & LUME | Sapphire with 2.5x Cyclops | Chromalight replica |
| DIMENSIONS | 31mm � 37mm � 10.2mmManual measurements �� minor tolerances apply. |
| WATER RESISTANCE | 50 Meters �� professional pressure test recommended before swimming |
Collector Q&A
Q: How does the weight of this ARF Datejust 31 compare to the genuine 278278?
A: The genuine Rolex 278278 is cast in solid 18k yellow gold and weighs significantly more. This ARF replica is constructed from 904L Oystersteel with an 18k gold plating, resulting in a total weight of 80 grams. It feels substantial for its size but will not replicate the exact heft of solid precious metal.
Q: Is the date magnification correct on the clone 2236 crystal?
A: Yes, the sapphire crystal features a Cyclops lens with the historically accurate 2.5x magnification. The date font is well-centered, and the lens includes a faint anti-reflective coating to reduce glare, closely mimicking the authentic crystal profile.
Q: Can the President bracelet be adjusted for very small wrists?
A: The President bracelet features removable screw-in links that allow for considerable adjustment. However, because it utilizes a concealed folding Crownclasp, there is no micro-adjustment mechanism. Achieving a precise fit relies entirely on adding or removing full links.
Q: How durable is the 18k gold plating on the ARF case and bracelet?
A: ARF utilizes a high-quality PVD plating method over the 904L steel base. While it is highly resistant to daily wear, it will eventually show signs of fading or scratching if exposed to abrasive chemicals, excessive friction, or deep gouges. We recommend avoiding ultrasonic cleaners and polishing cloths on plated models.
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