Quick Answer

A. Lange & Sohne has never produced a model called the Lange 2. Listings that use the phrase fake Lange 2 perpetual almost always mean a replica of the Lange 1 Perpetual Calendar, the brand's perpetual calendar model with the outsize date. Nothing in that category is a true 1:1 copy. The case shape, dial printing, and hand finishing on the better replicas hold up at arm's length. The calendar mechanism is where they part ways, and that is the part you cannot see from the outside.

Short version: expect a replica that keeps time, shows a working date, and has a moving moon phase. Do not expect a movement that tracks leap years.

What the Genuine Watch Does

The Lange 1 Perpetual Calendar belongs to the Lange 1 family and runs a manufacture calibre built around a perpetual calendar module. A real perpetual calendar keeps day, date, month, and leap year in step without correction, so the owner only resets it after the watch has stopped for a long stretch. That complexity is why the genuine piece sells in the six-figure range in US dollars.

How a Perpetual Calendar Works

A perpetual calendar is a mechanical program, not a stack of gears that counts to 31. A coded wheel or lever set tracks the 31-day and 30-day months, and a separate cam handles February 29 in leap years. The date rolls from February 28 to March 1 in a common year and from February 29 to March 1 in a leap year with no input from the wearer. Gregorian leap year rules mean the mechanism needs no adjustment until 2100.

What Replica Versions Deliver

Most replica Lange perpetual calendars use a generic automatic movement with a bolt-on calendar module, or a printed month ring driven off the date train. That produces behavior you can spot once you know the pattern.

Month display

When the month ring is geared to the date wheel, the month advances on a fixed cycle rather than on the true length of each month. The display reads correctly through most of the year, then drifts by up to three days after a 28-day February. It never handles February 29 the way a programmed calendar does.

Outsize date

The Lange outsize date uses two discs, one for tens and one for units. On the genuine watch the two jump as a matched pair. On a replica the units disc often moves a beat before the tens disc, so the window shows a gap or a stray digit for a few minutes around midnight.

Moon phase

A correct moon phase runs on a 59-tooth gear train, so the disc completes a cycle in about 29.5 days. Many replicas print a moon on a 24-hour disc, which means the phase changes once a day instead of once a month. Watch it for two nights and the error is obvious.

Movement finishing

Lange movements are hand engraved, with gold chatons, blued screws, and a hand-engraved balance cock. A replica at this price point rarely includes genuine engraving. Expect laser etching, plated screws, and a rotor with a printed or stamped logo.

Inspection Steps

  1. Ask the seller for a clear photo of the caseback and movement before you pay.
  2. Set the date to February 28, wind the watch forward, and note whether it moves to March 1 or stalls.
  3. Watch the date window across midnight and check whether both date discs move together.
  4. Photograph the moon phase disc on two consecutive nights and compare the position.
  5. Check the month ring against a calendar after you set the watch at the start of a month.
  6. Compare the case diameter and lug width to the published specifications of the genuine reference.
  7. Confirm the seller's return policy in writing before shipping.

Red Flags

  • Claims of 1:1 perfection on a perpetual calendar, which no replica maker has matched.
  • Descriptions that promise leap year accuracy without showing the movement.
  • Listings that call the watch a Lange 2, since the name does not exist in the catalog.
  • Prices far below the rest of the market, which usually means a quartz movement behind a mechanical looking dial.
  • Sellers who offer to ship the watch with a genuine box and papers for passing off as authentic. That is fraud, and it carries real legal exposure in the US.

What to Pay

Replica Lange perpetual calendars sit in a wide band. Simple versions with a decorated dial and a basic date run a few hundred dollars. Better builds with a functional month ring, a 29.5-day moon phase, and a closer case profile cost more, and a handful of sellers ask over a thousand. Pay for the parts you can verify, not for the label on the listing.

Bottom Line

Treat a replica Lange perpetual calendar as a cosmetic piece with a partial calendar. Judge it on the case profile, the dial layout, and the outsize date, because those are the elements you see every day. The leap year program is the one feature that will not survive the replica process, and no listing should tell you otherwise.