Short Answer

A fake Mark 11 is a copy of the IWC Mark XI, the pilot watch IWC made for the Royal Air Force. The original ran from 1948 to 1984. Chinese sellers ship copies with 36 mm to 40 mm steel cases, printed black dials, and low-cost automatic movements. Prices sit between $60 and $400. No copy uses an IWC Calibre 89.

What the Original Used

IWC built the Mark XI to RAF spec, store reference 6B/346. The case measures 36 mm across. The movement is a manual-wind IWC Calibre 89 with hacking seconds. A soft iron inner case and dial shield the movement from magnetic fields. The crystal is plastic. The dial is black with white numerals, a triangle at 12, and the British broad arrow. Issued casebacks carry a military serial number, the 6B/346 code, and a year.

What Copies Reproduce

  • Black dial with white printing and a triangle at 12.
  • Sword hands with lume fill.
  • Stainless steel case, 36 mm to 40 mm, screw caseback.
  • Strap options: leather, NATO nylon, or canvas.
  • Caseback engraving with fake 6B/346 text and serial numbers.

Movements in Replica Mark 11 Watches

Most copies run one of four movements: the DG2813 at 21,600 vph, the Seagull ST16 or ST21, the Miyota 8215, or a clone of the ETA 2892. Beat rates land between 21,600 and 28,800 vph. Timekeeping on a new copy runs 10 to 30 seconds per day. The original Calibre 89 beats at 18,000 vph. Movement finishing differs, and IWC engraving on a copy does not match the factory pattern.

Price Tiers

  1. $60 to $120: mineral glass, stamped caseback, DG2813, 36 mm case.
  2. $150 to $250: sapphire glass, Seagull or Miyota movement, closer dial print.
  3. $300 to $400: super clone claims, 39 mm or 40 mm case, clone 2892, stronger lume.

Checks on a Claimed Replica

  • Ask for the case diameter in millimeters. Sellers quote 36 mm, 38 mm, 39 mm, and 40 mm.
  • Ask for the movement name and beat rate.
  • Ask for a photo of the caseback text.
  • Ask about lume type. Original tritium paint died years ago, so a glowing original dial is a red flag.
  • Ask for the case weight without a strap. Factory figures vary.

Limits

Copies do not match the Calibre 89, the soft iron shield, the plastic crystal, or the RAF issue paperwork. Water resistance claims of 30 m to 50 m come from the seller and are not test data. Dial font, hand shape, and crown size vary between factories and between batches. A copy is not a collectible. Resale value is close to zero.