Short answer
525.10 is not an Omega reference number. Omega writes Constellation Globemaster references in the 130.xx.39.21.xx.xxx format. The 525.10 string comes from sellers, not from Omega. Treat it as a batch code or listing code. The watch behind the code copies the Omega Constellation Globemaster: 39 mm case, fluted bezel, pie-pan dial, date at 6 o'clock.
The watch being copied
Omega introduced the Constellation Globemaster in 2015. It was the first watch to carry Master Chronometer certification. The number 525.10 does not appear in Omega catalogs or on genuine case backs.
- Case: 39 mm across. Stainless steel, 18k Sedna gold, or two-tone.
- Bezel: tungsten carbide, cut with narrow flutes.
- Dial: pie-pan profile, applied hour markers, date at 6 o'clock.
- Movement: calibre 8900 in steel, calibre 8901 in gold.
- Certification: eight METAS tests, run on the finished watch.
- Magnetic resistance: 15,000 gauss.
- Power reserve: 60 hours. Co-Axial escapement. Silicon balance spring.
- Water resistance: 100 m.
- Case back: solid steel, stamped with an Observatory medallion.
Points that differ on a replica
Many sellers skip full specs. Ask for each item below in writing.
- Bezel material. Genuine uses tungsten carbide. Copies use polished steel. The two look close in photos and differ in weight and scratch resistance.
- Case thickness. A 39 mm copy built on a stock movement runs thicker than the genuine case.
- Dial depth. The pie-pan step is shallow on low-tier copies.
- Date window. Check the cut edge and the font of the numeral.
- Crystal. Genuine uses a domed sapphire with anti-reflective coating on two faces. Copies often coat one face.
- Movement. Common options are decorated clones of the ETA 2824 or a Chinese automatic. None carry METAS certification. No copy can, because METAS tests the finished watch.
- Case back. The medallion engraving loses detail on cheap stamps.
- Bracelet and clasp. Check link count, taper, and the micro-adjust setting.
- Water resistance. A number in a listing is not a test result. Do not swim with a copy unless the seller has pressure-tested it.
What to ask before buying
- Movement model and jewel count.
- Case diameter and thickness in millimeters.
- Bezel material.
- Photos of the case back and the clasp.
- Return window and payment method.
Price range and legal note
Shops that sell first copy watches list this tier in the low hundreds of US dollars. Price tracks the movement and the bracelet, not the dial printing. In the United States, 18 U.S.C. 2320 makes trafficking in counterfeit goods a federal offense. Check the rule in your own country before you order.