The short answer

If you want a replica Lange perpetual calendar, judge the calendar behavior first and the branding last. Ask the seller one question before anything else: does the date roll from February 28 to March 1 without a pusher in a non-leap year, and from February 28 to February 29 in a leap year? Very few replicas pass that test. Most watches sold under this phrase carry an annual calendar module or a plain date wheel paired with a perpetual-style dial. Once you know which one you are buying, the rest of the decision is about case accuracy, dial printing, movement finish, and how the watch wears. Skip the rest of the listing photos until that answer is settled.

What "Lange 2 Perpetual" means in practice

A. Lange & Söhne has never released a model called the Lange 2. The phrase is search language, not a catalog reference. It most often points to the Lange 1 Perpetual Calendar, a self-winding watch the brand introduced in 2021 with an outsized date, a day and month display, and a moon phase that stays accurate for more than a century. Some listings stretch the name to cover the Lange 1 Moon Phase or a Datograph, and a few sellers attach it to watches that only look similar from across a room.

That naming drift matters when you shop. Two listings with the same title can be built on completely different cases and movements. Before comparing anything, confirm which genuine reference the replica is trying to copy, then judge the copy against that reference instead of against the marketing text.

What to look for

• Calendar logic. Set the watch to a date before a 30-day month end and watch it step over. Repeat at February in a leap year and a non-leap year. This is the only test that separates a perpetual from an annual calendar.
• Pusher layout. Genuine perpetual calendars use recessed correctors for month, day, moon phase and date. A replica with a single pusher doing all the work is a simple calendar underneath.
• Dial printing. Look at the thickness of the text and the spacing of the subdials. Blurry or uneven printing shows up first on macro photos and on the wrist under any light.
• Date aperture. The outsized date is two discs. They should align with equal gaps above and below the digits, and they should flip together.
• Case proportions. Measure the case yourself with calipers, and check the lugs. A case that has been stretched or shrunk to fit a stock movement loses the shape that makes the watch read correctly.
• Movement finish. Expect machine-applied decoration at replica pricing. Look for coarse striping, uneven anglage on the bridges, and screws with damaged slots.

Parameter bands worth checking

• Case diameter: expect roughly 40 to 42.5 mm for a Lange 1 style case. Anything under 39 mm or over 43 mm will sit differently from the watch it copies.
• Thickness: 11.5 to 13.5 mm. A calendar module adds height, so a very thin case is a warning rather than a bonus.
• Lug width: 20 mm is the common fit on this case family. Confirm before you order a strap.
• Water resistance: printed ratings of 30 m or 50 m are splash ratings under standards such as ISO 22810. Treat them as rain protection only.
• Power reserve: 40 to 72 hours is typical for the automatic movements used in this class. If the watch stops overnight, the rotor or the mainspring is the problem.
• Crystal: sapphire front and back. Mineral glass scratches and shows a different reflection at an angle.

Pitfalls that catch most buyers

• A perpetual dial on a non-perpetual movement. This is the single most common misrepresentation in this market.
• Moon phase error. A standard 59-tooth moon disc drifts about one day every two and a half years; the genuine watch is geared far more closely. Replicas rarely match that.
• Reused catalog images. If the photos show a studio background and a serial number that never appears in a buyer's picture, ask for dated photos of the actual watch.
• Plating wear. Gold-colored replicas are plated. The lugs, the crown and the clasp lose color first.
• Customs and legal exposure. Counterfeit watches are prohibited from import in the United States and can be seized and destroyed, so an order can end with a loss and no recourse.
• Servicing gaps. Many watchmakers will not touch a replica, and parts for a cloned calendar module can be impossible to source.

FAQ

Does any replica actually track leap years?

A small number of high-end replicas use a true perpetual calendar module. Most do not. Test the February transition before you believe the label, and get the answer in writing from the seller.

What does "Swiss made" mean on these watches?

On a counterfeit, it means nothing enforceable. The marking is cosmetic. Judge the movement by how it runs and how it finishes, not by the stamp.

Can I swim with one?

No. Even when a rating is printed on the back, gaskets on replicas are often the cheapest part of the build. Keep it away from water, steam and saunas.

How do I set the calendar safely?

Move the hands forward to a safe zone well away from midnight, then use the correctors in the order the layout requires: month, then day, then date, then moon phase. Never push a corrector while the date change is in progress, which on most movements happens in the hours around midnight.

Is it worth buying at all?

Only if you accept the legal and servicing risk and you value the look over the mechanism. If the calendar function is what draws you to the watch, a replica perpetual copy rarely delivers it.