The short answer
The Rolex 278273 is a Datejust 31 in yellow Rolesor: a 31mm Oystersteel case with an 18k yellow gold fluted bezel, gold crown, and a two tone bracelet. A first copy of it tries to reproduce that exact shape and finish at a fraction of the retail price. The reference is also one of the most mislabeled in the replica market, because sellers mix it up with the 36mm Datejust 126233 and with the 26mm Lady Datejust. If the case does not measure roughly 31mm across, it is not a 278273 copy, no matter what the listing claims.
What the genuine 278273 actually is
Knowing the real spec is the only way to judge a copy, so start here.
- Case: 31mm diameter, Oystersteel, polished lugs with brushed sides
- Bezel: 18k yellow gold, fluted. Diamond set bezels exist on factory variants
- Movement: caliber 2236, automatic, Syloxi silicon hairspring, about 55 hours of power reserve
- Water resistance: 100m on the genuine watch
- Bracelet: Jubilee is the common pairing, Oyster is also offered
- Dial: 3 o'clock date with a 2.5x cyclops over the crystal
That 31mm number matters more than anything else for a buyer. The 278273 is a midsize watch. It wears small on a 7.5 inch wrist and looks proportionate on 5.5 to 6.5 inch wrists. Plenty of people order it expecting a standard men's Datejust and get something that feels like a ladies' watch to them.
The three tiers you will run into
Copy watches are not one product. They come in bands, and the band determines whether the watch lasts a month or a decade.
- Entry: quartz or cheap automatic, plated bezel, stamped clasp, printed dial. The fluting on the bezel is usually shallow and rounded. Date font is wrong and the cyclops has little or no magnification.
- Mid: Japanese or Chinese automatic, better case finishing, screw down crown, decent bracelet. Bezel is often gold plated over brass or steel. This is the band most casual buyers end up in.
- Top: cloned movement with the correct beat rate, solid or thickly plated gold elements, individually numbered cases, and bracelets with the correct taper and end link fit. Prices here start in the several hundreds and climb.
The details that separate a good copy from a bad one
I look at five things first, in this order.
- Bezel fluting. Genuine fluting has sharp ridges with crisp polish and a visible bevel between each facet. Soft, wavy flutes are the giveaway on almost every cheap 278273 copy.
- Dial printing. Text should sit flat and level, with even spacing between the coronet and the two lines of type. Crooked or thick printing kills the illusion instantly.
- Cyclops and date. The magnification should be around 2.5x and the date window should sit under the lens with no halo of glue. A flat, unmagnified date window is a hard no.
- Bracelet and end links. Solid end links should sit flush against the case with no gaps or wiggle. Center links should show the correct gold tone, not an orange or brassy cast.
- Weight and feel. A two tone Datejust 31 has heft. If the watch feels hollow and light, the case is thin and the bracelet is stamped.
Movement checks before you pay
Ask what powers it and ask for a photo of the caseback off if you can get one. A mechanical movement with the correct beat rate sweeps smoothly at eight ticks per second. A 21,600 bph movement is visibly choppier next to it, and quartz ticks once per second with a dead giveaway jump. Then check function: the crown should wind without grit, the date should quickset, and the seconds hand should hack when you pull the crown. A watch that fails any of those is not worth returning shipping costs.
Sizing, and the reference mix up
The 278273 is 31mm. The 126233 is 36mm. The 279173 is the 26mm Lady Datejust in yellow Rolesor. Sellers list all three under the same photos constantly, so confirm the measurement in writing before you order, and confirm the bracelet length. A 31mm Jubilee is built for smaller wrists, and adding links on a copy is often impossible because the end links are not standard.
Legal and practical reality in the US
Counterfeit watches are illegal to import into the United States, and US Customs seizes them routinely. Beyond the law, there is no service path: no Rolex service center will touch it, independent watchmakers often decline, and resale value is effectively zero. The gold on almost every copy is plating or PVD, not 18k, so do not expect scrap value either. Treat the money as spent on a wearable object, not an asset.
Questions worth asking before you buy
- What is the exact case diameter, in millimeters?
- Which movement, and what beat rate?
- Is the bezel solid gold, plated, or PVD coated, and how thick is the coating?
- Are the end links solid or folded?
- What is the bracelet length and are spare links included?
- What happens if it arrives with a dead movement?
Clear answers to those six questions tell you more about a seller than any photo set. Vague replies, or a refusal to state the case size, are your signal to walk away.