Quick answer

The Breguet Type XX Transatlantique ref. 3820 is a steel chronograph with a date and a 24-hour subdial. Breguet added it to the Type XX line in the mid-1990s as a civilian follow-up to the ref. 3800. Replica sellers use the same reference number. Most copies run an Asian Valjoux 7750 clone, a Seagull ST19 hand-wind, or quartz. Price band for replicas sits near $150 to $500. The 24-hour subdial is the part most often faked.

Case and dial

Steel case, listed at 39 mm to 39.5 mm across depending on the source. Lug width 20 mm. Water resistance rated at 100 m on the original. Crown at 3 o'clock, two pushers. Some versions carry a rotating 60-minute bezel, others a fixed bezel with a 12-hour scale.

Dial variants include black with Arabic numerals and luminous plots, and a lighter silver finish. Subdial positions differ between the 3800 and the 3820. Compare any listing to a photo of the exact reference before judging layout.

Movement

Breguet used a Lemania-based automatic chronograph. Published references list the Lemania 1350 and 1352 across the production run. Both are cam-switched automatics. The 1352 drives a 24-hour indicator.

Replica movements:

  • A7750 clone, automatic, 28,800 vph, 24-hour hand added on top. Common in mid-tier copies.
  • Seagull ST19, hand-wound. Cheaper, no 24-hour function.
  • Quartz. Found under $100.

Differences to check

  • 24-hour hand speed. It should turn once every 24 hours. On many replicas it turns once every 12 hours.
  • Caseback engraving. Originals use a deep etch with reference and serial numbers. Copies use shallow stamping and wrong font weight.
  • Date window. Originals have a beveled aperture. Copies use wider numerals and a flat cut.
  • Pusher feel. A7750 clones have long, soft travel. The original resets with a short, firm click.
  • Subdial spacing. Reps sit the counters a fraction off center because the base movement dimensions differ.

Price

Secondary market originals trade from about $5,000 to $10,000 depending on box, papers, and service records. Replica sellers list single pieces at $150 to $500. Wholesale lots cut the per-unit price. Watch for listings that quote a reference number but ship a different dial color.

Legal note

Counterfeit watches are illegal to import and sell in the United States. Customs can seize shipments. That risk applies to buyers as well as sellers.