A replica Omega 3520 is a copy of the early 1950s Omega Constellation, the watch line that used Omega's Calibre 3520 bumper automatic. No replica factory rebuilds that movement today. The copies pair a modern automatic or quartz caliber with a case, dial, and hands styled after the original.

What Is the Omega Calibre 3520?

The 3520 is a Swiss automatic from the early 1950s, made in the years when bumper winding was still common. It carries 17 jewels. Omega finished it to chronometer standard and fitted it to Constellation references, the line that carried official chronometer certification.

Bumper winding works like this: the weight swings part of a turn and strikes a spring at each end of its travel instead of spinning a full circle. You feel a small thump on the wrist, and the watch gives a faint knock if you shake it near your ear.

  • Maker: Omega
  • Type: bumper-wind automatic
  • Jewels: 17
  • Beat rate: 19,800 vibrations per hour
  • Era: early to mid 1950s
  • Winding: weight hits two springs, no full rotor

Omega later moved to full-rotor automatics that wind in any direction and need no springs. That shift is why the bumper calibres stayed in the 1950s.

Does a Replica Omega 3520 Use the Real Movement?

No. The 3520 left production in the 1950s and surviving examples are scarce, so no factory copies it. The parts are tiny, the demand is thin, and a current automatic costs less to build and service.

Most replica Omega 3520 watches run a modern Asian automatic, often a copy of the ETA 2824 layout or a Miyota design. Cheaper builds drop in quartz.

Ask for a photo of the movement before you pay. A seller who will not open the case back has answered your question already.

What to Check on the Watch

Case

  • Diameter near 35 mm on Constellation-style copies
  • Domed acrylic crystal, not flat sapphire
  • Thin, curved lugs with a soft bevel
  • Case back with the observatory medallion, not a plain screw-down
  • Even brushing and polishing lines, no tool marks at the lugs

Dial

  • Pie-pan surface with a step before the edge
  • Applied star and wordmark below 12
  • Crosshair or plain finish, matching the reference you asked for
  • Print that holds up under a loupe, no fuzzy edges

Hands

  • Dauphine or leaf shape, tapering to a point
  • Length that reaches the minute track
  • Even finish, or no lume at all on older references

Crown

  • Small crown sitting close to the case
  • Correct alignment with the case tube
  • Winds without grit or slack

Replica Tiers and What They Cost

  • Quartz tier: thin case, printed dial, ticking seconds hand. The cheapest way into the look.
  • Automatic tier: modern automatic movement, better case finishing, dial details that survive close viewing.
  • Top tier: cloned or decorated movement, dial print matched to a real reference, spec-correct crystal.

Prices move with supply, so treat any quote as a snapshot rather than a rule. Compare three sellers on the same reference before you commit, and check what the price includes for shipping and returns.

Red Flags

  • Photos that show up on other sellers' pages (run a reverse image search)
  • "Swiss made" on a watch that costs less than a service
  • Water resistance claims above 30 m on a thin vintage-style case
  • No movement photo, no return policy, no payment protection
  • Pre-aged dials and hands sold as genuine vintage parts

Servicing and Care

A real 3520 needs a watchmaker who keeps bumper parts, and those are getting harder to find. A replica with a modern automatic is easier to live with, since most shops can regulate or swap it.

Keep any vintage-style build away from water. The gaskets on thin, domed cases seldom seal well, and acrylic picks up scratches.

Have the movement cleaned every few years if you wear the watch daily. On bumper calibres, the springs and rotor pivots wear first.

Frequently Asked Questions

Is a replica Omega 3520 the same as a genuine Constellation?

No. It copies the look, not the movement, the materials, or the build standard. A genuine 3520 Constellation carries a chronometer-rated movement and a serial number you can date.

Can I hear the bumper in a replica?

Almost never, because replicas run full-rotor automatics or quartz. A real bumper knocks against its springs when you tilt the watch.

How do I date an original 3520?

Use the movement serial number and Omega's own archives. Case reference numbers and dial styles narrow the year further.

Will a replica hold its value?

No. Replicas trade below retail and lose value with wear. Treat the purchase as a cost, not an investment.

Which size should I pick?

Match the original: about 35 mm for a 1950s Constellation. Larger copies exist, but they read as modern watches rather than vintage ones.