Short answer
No Omega model in the current catalog carries reference 5710. Omega publishes current references as long numeric strings, for example 210.30.42.20.03.001. Vintage Omega references run six digits with a decimal point, such as 168.005. The four digits 5710 match neither pattern. "Replica omega 5710" is a search string that sellers use, not an Omega reference. What the listing points to varies. Ask the seller for the case number stamped inside the caseback and the caliber number on the movement, then compare both against Omega's vintage records.
What the digits may mean
Three options cover most cases.
- A seller SKU. Replica sellers assign short codes to a design. The code has no link to Omega.
- A mistyped caliber. Calibers 570 and 571 sit in Omega's 5xx family of the 1960s and served the Constellation line. A caliber numbered 5710 does not appear in the caliber tables for that generation. A buyer who typed "5710" usually wants a Constellation-style three-hand watch.
- A mistyped case number. Omega case numbers from the 1950s and 1960s include four-digit and six-digit forms. Typos pass between listings.
What the watch on the page usually is
Replicas of vintage models and replicas of current models differ. Check these specs.
- Case size. Original Constellation cases from the 1950s and 1960s measure 34mm to 35mm. Many replicas measure 38mm to 42mm. A large case copies a different look.
- Movement. Listings state quartz, "automatic 21,600 vph", or "clone ETA 2824, 28,800 vph". Omega 5xx movements ran at 19,800 vibrations per hour. A 28,800 vph movement is a modern design.
- Caseback. Original Constellation backs carry an observatory medallion in relief plus a stamped reference and serial. A laser-etched back points to a modern case.
- Crystal. Models from the 1950s and 1960s used acrylic. Sapphire points to a modern case.
- Dial print. Compare the font of "Omega" and the position of "Constellation" against photos of an original. A 3x zoom settles it.
Checks before payment
- Ask for a photo of the movement with the balance visible.
- Ask for the inside caseback stamp and the caliber number.
- Ask for case diameter in millimeters, not "large" or "oversize".
- Ask if the bracelet uses solid links or folded links. Solid links add weight.
- Ask for water resistance in meters and the test used. Most replica claims of 30m or 50m come with no pressure test. Treat the watch as splash-proof.
- Ask about service. A 21,600 vph movement often needs regulation on arrival.
Price bands
Quartz copies of a vintage three-hand design sell from $30 to $80. Automatic copies with a Chinese 21,600 vph movement sell from $80 to $180. Copies with a 28,800 vph clone movement and sapphire glass sell from $180 to $450. Gold plating adds $30 to $60. Nothing in these bands buys a Swiss movement or a pressure-tested case.
Legal status
Counterfeit goods are illegal to import into the United States and face seizure by U.S. Customs and Border Protection. A watch that copies Omega's name, symbols, and case design falls inside that rule. The buyer carries the loss when customs holds the parcel.