Short answer

Seamaster 300 50th Anniversary is not an official Omega model name. The Seamaster 300 launched in 1957 as reference CK2913, so its 50th year was 2007. Omega catalogs do not list a Seamaster 300 sold under that label. The phrase comes from sellers. It gets applied to three different watches: the 2014 Seamaster 300 Master Co-Axial, the 2015 Seamaster 300 Spectre limited edition, and 1957-style homages. Match the caseback reference number before you pay.

Which watch the term points to

1957 Seamaster 300, reference CK2913

Omega released the Seamaster 300 in 1957 next to the Speedmaster and the Railmaster. The three formed the Trilogy. The CK2913 had a 39 mm steel case, a black dial, a broad-arrow hour hand, and a lollipop seconds hand. Water resistance was rated at 200 m.

2014 Seamaster 300 Master Co-Axial

Reference 233.32.41.21.01.002. Case size 41 mm. Caliber 8400, automatic, co-axial escapement, 60-hour power reserve. Bi-directional bezel with a Liquidmetal dive scale. Black dial. Broad-arrow hour hand. Lollipop seconds hand. Date window at 3 o'clock.

2015 Seamaster 300 Spectre limited edition

Built for the 2015 film Spectre. 7,007 pieces. 41 mm steel case. Caliber 8400. No date window. The bezel has no full minute scale.

What replica versions copy

Most replicas target the 41 mm Master Co-Axial case. Common specs:

  • Case: 41 mm diameter, about 48 mm lug to lug, 13.5 mm to 14.5 mm thick, 316L steel or claimed 904L steel.
  • Crystal: sapphire with anti-reflective coating on mid and high tiers, mineral glass on low tiers.
  • Movement: Seagull ST21 or a clone of the ETA 2824 on automatic tiers, quartz on low tiers.
  • Bezel: bi-directional, printed or inserted scale. No Liquidmetal.
  • Water resistance: marked 300 m. The tested rating is unknown.

Where replicas fall short

  • Movement: no co-axial escapement, no silicon balance spring.
  • Certification: no METAS Master Chronometer test. That test runs 8 checks, including exposure to 15,000 gauss.
  • Case finishing: bevels and brushing on the lugs differ from the genuine case.
  • Dial print: font weight and spacing of the dial text vary. Lume color runs green on some units and blue on others.
  • Date window: position and magnification are frequent errors. The Spectre edition has no date, so any replica with a date at 3 o'clock copies the wrong watch.

Price tiers in the US

  • 30 to 80 USD: quartz, mineral glass, stamped caseback, plated brass or low-grade steel.
  • 150 to 350 USD: automatic clone, sapphire, 316L steel, screw-down crown.
  • 400 to 700 USD: better dial and hand finishing, tighter bezel action, claimed 904L steel.

These ranges come from typical US listing prices. Shipping and currency move them.

Checks before you pay

  1. Ask which reference the seller copies: 233.32.41.21.01.002 for the standard model, Spectre for the no-date version.
  2. Ask for calipers in a photo. Case diameter should read 41.0 mm plus or minus 0.3 mm.
  3. Ask which movement sits inside. Claims of a Swiss ETA on a 200 USD watch are almost always false.
  4. Ask for a timing reading in seconds per day. Anything past plus or minus 20 seconds per day needs regulation.
  5. Get the return policy in writing before payment.

Legal status

In the US, trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. US Customs and Border Protection can seize shipments under 19 CFR 133 and 19 CFR 134. Omega is a Swatch Group brand and enforces the trademark. A replica carries no factory warranty and cannot be serviced by Omega or an authorized dealer. Resale value is near zero.