The replica Omega Constellation 131 is a modern reproduction of Omega's 1960s no-date Constellation chronometer, a 34.5 mm stainless steel watch with an automatic movement, a pie-pan or flat dial, and the gold observatory medallion on the caseback. Original 131-series references were built roughly between 1962 and 1968 and carried chronometer-rated calibers such as the 551 and 561. Replicas copy that footprint, dial layout, and caseback detail at a fraction of the vintage price.
Which References Fall Under the 131 Family?
Omega used the 131 case code for Constellation models without a date window. Common members include 131.021, 131.022, 131.025, and 131.026. All of them share the same case diameter, an 18 mm lug width, and a movement family that was adjusted to chronometer standards.
Key Specs at a Glance
- Case: 34.5 mm stainless steel, press-fit or screw-down back
- Movement: automatic, no date, chronometer grade (551 or 561 base)
- Dial: pie-pan or flat, applied logo, star marker near 6 o'clock
- Lug width: 18 mm
- Crystal: domed acrylic on originals, acrylic or mineral glass on replicas
- Weight on a leather strap: about 50 to 60 grams
How Do You Judge Replica Quality?
Start with the case profile, because vintage Constellation cases curve into the lugs instead of meeting them at a hard angle. Check that the bezel is thin, the lugs taper, and the crown sits close to the case without a gap. A case that looks thick or flat from the side is the fastest sign of a low-grade build.
Next, look at the dial. Printing should be crisp, the star and logo should be applied rather than painted, and the minute track should sit evenly inside the chapter ring. Ask for macro photos under daylight, since indoor shots hide uneven printing and misaligned markers.
Which Movement Should You Choose?
Three options cover most replicas. A basic Japanese automatic is affordable and easy to service. A Miyota 9015 or a Seagull ST2130 gives smoother sweep and better timekeeping. A Swiss or Swiss-style automatic sits at the top and usually comes with the best case finishing.
Because the 131 has no date, confirm with the seller that the movement runs without a ghost date position at the crown. Some builds hide a date wheel under the dial, which is fine as long as the crown has no dead click.
Dial and Case Variations to Look For
- Pie-pan dials with a raised inner ring, most common on earlier pieces
- Flat dials with a printed minute track on later references
- Silver, champagne, black, and crosshair finishes
- Gold-capped and steel cases, though replicas lean toward steel
What Does a Good Replica Cost?
Entry builds run about $80 to $150 and often show a thick case and painted markers. Mid-tier versions sit near $180 to $300 with a better dial and a smoother movement. Top builds reach $350 to $500 and focus on case curvature, medallion depth, and hand finishing.
Is the 34.5 mm Case Too Small Today?
No. A thin bezel and a wide dial make the watch wear closer to a modern 36 mm piece. Most wrists between 6.5 and 7.5 inches find it balanced, and it slips under a cuff easily.
Strap and Sizing Tips
An 18 mm leather strap in tan, black, or dark brown suits the period look. A beads-of-rice or flat-link steel bracelet also works if you want a dressier feel. Measure your wrist before ordering and add about 10 mm to the strap length for a comfortable fit.
Quick Buying Checklist
- Ask for daylight photos of the case from the side
- Confirm the movement has no date position
- Check dial printing, applied logo, and marker alignment
- Verify the caseback medallion is stamped, not printed
- Ask about water resistance before wearing it near water