The short answer
Fake Lange 2 perpetual 725.038 is a listing tag, not a factory spec. It points to a first copy of an A. Lange & Söhne style perpetual calendar, where the number identifies a case metal, dial colour and movement choice in one seller's catalog. Two shops can print the same digits on two watches that differ inside. So the useful question is not what the number means, it is what is actually in the case and how the calendar behaves once you wear it.
On this kind of search, the numeral after the brand name usually marks a case or generation variant. Lange 2 tends to mean the larger cased version in that shop's range. Treat the whole string as a product ID and read the spec sheet behind it.
What a first copy perpetual calendar can and cannot do
A real perpetual calendar tracks uneven month lengths and leap years, and Lange's own perpetual models run without a manual leap-year correction until 2100. Replicas almost never reach that. Most so-called perpetual models are annual calendars, which need one correction each February, or plain triple calendars driven by pushers in the case flank. Some are built from a modular calendar plate bolted onto a base automatic, which is honest enough but adds thickness.
What you can get is the look and the wrist presence. Big date, moonphase, month ring, subdial layout, case proportions. What you rarely get is correct calendar logic for the next forty years. Set your expectations there and the watch is fine. Expect genuine leap-year mechanics at this price and you will be disappointed.
What I look at first
- Calendar behaviour. Advance the date through a month end and watch the day, date and month discs move together. Sticky or half-skipping discs mean a cheap module.
- Moonphase accuracy. A correct moon disc drifts about one day every two and a half years. A 29-day disc drifts far faster and is a giveaway.
- Big date windows. Two separate discs should sit level with even gaps, matched font weight and no shadow line between them.
- Case thickness. Perpetual dials and calendar plates stack. If the case is as slim as a plain three-hander, something has been faked in the wrong direction.
- Correction pushers. Four or five recessed pushers on the flank is normal. Flush or missing pushers mean the calendar is decorative.
Movement finish through the back
If the watch has a display back, that is where the money shows. Look for a hand-engraved balance cock, blued screws, gold chatons and Geneva stripes that run in one direction. Printed or stamped decoration looks flat under a loupe. A rotor that wobbles or spins freely with a cheap rattle is a sign of a low grade base movement.
Dial and case at arm's length
Most people judge a watch from a metre away. Check the chapter ring printing under a phone camera, since small cameras magnify flaws. Applied numerals should sit flat and catch light on their bevels. The date font should match the brand's own proportions, not a generic stencil. Case lugs should have a defined bevel, not a soft blob, and the crown should engage cleanly at every position.
Before you order
- Ask which base movement is used and whether the calendar module is added or integrated.
- Ask for real photos or a short video of the date changing, not stock renders.
- Confirm case diameter, thickness and lug width in millimetres.
- Check the return window and whether a service is offered if the calendar jams.
Buying a copy of a five-figure perpetual calendar is a value decision, and the honest version of that decision is this: you are buying appearance and a working calendar, not a lifetime of horological engineering. Choose a seller who describes the movement plainly, and you will know exactly what arrives.