The short answer
A fake Type 21 flyback replica is worth buying only when the flyback works. That function is the reason the original exists: one push of the reset pusher sends the chronograph hand back to zero and restarts it while the watch keeps running, so you can time back to back legs without stopping and restarting. Almost every replica Type 21 on the market uses a stock Valjoux 7750 clone or a Seagull ST19, and neither movement has flyback. When a listing shows a 7750 clone and still says flyback, the word is a label, not a feature. Ask for a short video of the chronograph running, then of the reset pusher being pressed once. If the hand parks at zero and needs a second push to move again, walk away and look at the next seller.
What the Type 21 name refers to
Breguet built chronographs for French military aviation under the Type 20 and Type 21 designations from the 1950s, and the modern Type XXI references brought the name back with a flyback chronograph and a central chronograph minute hand. The military watches were tool pieces: matte black dials, large printed numerals, syringe or baton hands, a bezel marked with a tachymeter or 12 hour scale depending on the reference, and a case in the 38 to 40 mm range.
That last point matters more than most buyers expect. A replica that ships at 44 mm with a 24 mm strap is not a Type 21 with a bigger case, it is a different watch with a similar dial.
fake type 21 flyback timepiece
How to test the flyback in three steps
- Start the chronograph with the top pusher and let it run past 60 seconds.
- Press the bottom pusher once. A true flyback snaps the hand to zero and keeps counting from that moment without any further input.
- Watch for the tell. If the hand parks at zero or the seconds stop, the watch has a standard stop reset lever, not a flyback.
Do this on a live video call or with a seller supplied clip. Still photos prove nothing here.
What to look for
Movement
A hand wound column wheel calibre such as the Seagull ST19 gives a smooth pusher feel and a column wheel you can see through a display back. An automatic 7750 clone gives 40 to 48 hours of reserve and a wobbling rotor. If a seller claims a Lemania based flyback or a modular Dubois Depraz setup, ask for clear movement photos, and expect a higher price and harder service. Remember that neither the 7750 nor the ST19 delivers flyback in stock form, so a working flyback points to a modified or higher tier calibre, and the price and the service story should match that.
Case and dimensions
Aim for 38 to 41 mm across, 12 to 15 mm thick, with 20 mm lugs. Drilled lugs suit the vintage theme and make strap swaps easy. Check the lug to case transition on side photos: thick slab lugs and a wide crown guard read as a modern pilot watch, not a 1950s chronograph.
Dial, hands, and lume
Matte black or grey dial, printed numerals, and subdials that match the reference you are copying, whether two registers or three. Check that subdial hands reach their marks and that the positions line up with the gen. Lume should follow one theme across dial plots, hands, and bezel pip. Cream plots with bright white hand lume is the fastest daylight tell.
Crystal and bezel
Most builds use domed sapphire with inner coating, while vintage style builds use acrylic. Press the bezel around its full circle and look for back play or a triangle that will not sit at 12.
Caseback and markings
Military style references use solid casebacks with engraved reference and serial numbers. Newer builds show the movement through a display back. Text on a caseback is decoration on a replica, so judge the engraving depth and the font, not the words.
Strap and hardware
Look at buckle thickness, spring bar quality, and stitch density. A thin stamped buckle on a heavy case is a common shortcut.
Parameter bands worth aiming for
- Case diameter: 38 to 41 mm.
- Case thickness: 12 to 15 mm. Under 12 mm on an automatic chronograph usually means quartz or a mislabelled case.
- Lug width: 20 mm on most references. 22 mm reads oversized.
- Crystal: domed sapphire with inner anti reflective coating, or acrylic on a vintage build.
- Water resistance: 50 to 100 m claimed. Treat it as splash proof at best and keep it out of the pool.
- Power reserve: 40 to 60 hours on a hand wound column wheel movement.
- Lume: one family only, either aged cream or clean white, across dial, hands, and pip.
- Chronograph: flyback confirmed on video, firm pusher with a defined click, hands that snap back without overshoot.
Pitfalls that cost you money
- Grade words. Terms like AAA or top grade say nothing about the movement or the finishing.
- Stock photos. Insist on photos of the exact watch, with a timestamp, before payment.
- Unverified flyback claims. If the seller cannot show the function, assume it is absent.
- Wrong scale. Oversized cases and 24 mm lugs break the look of a military chronograph.
- Mismatched lume. Mixed lume tones show up in daylight and in every wrist shot.
- Spare parts. A calibre with no parts channel in your country becomes an expensive paperweight after one drop.
- Customs and returns. Cross border shipping with no local repair path leaves you with no recourse.
FAQ
Does a fake Type 21 flyback replica actually have flyback?
Rarely. Stock 7750 clones and ST19 movements do not, so most builds labelled flyback are standard stop reset chronographs. Treat flyback as a claim to be tested, not a spec to be trusted.
Is a quartz Type 21 replica worth considering?
Only if you want the look and do not care about pusher feel. Quartz chronographs start and stop with a light touch, and a subdial hand that ticks in one second steps is easy to spot.
Which case size gets closest to the original?
38 to 40 mm. Above 41 mm the bezel and dial proportions change, and the watch wears like a modern pilot chronograph instead of a 1950s military tool.
Can a local watchmaker service a replica Type 21?
Often yes, if the calibre is a common Chinese or Swiss chronograph movement. Confirm the movement model before buying, and ask whether replacement gaskets are available for the case.
Should I trust Swiss made text on the dial?
No. On replicas the marking is decorative. Movement photos and pusher feel tell you far more than the text on the dial.