Direct answer: there is no A. Lange & Söhne model called the Lange 2, and 401.021 is not a reference number that appears in Lange's published catalogue for the Lange 1 line. A watch sold as a "Lange 2 401.021" is therefore one of three things: a fantasy listing, a mislabelled Lange 1, or a replica. The criteria used below are the ones that separate those cases: model naming and reference block, movement architecture and finishing, case and dial execution, and paperwork that matches the serial.
Where the Name and Number Come From
Search data shows this phrase is a mash-up. "Lange 2" reads like a sequel to the Lange 1, a model that has never had a numbered successor. The digits 401.021 look like a case reference because Lange does use dotted numeric references, but they belong to a different block than the one the Lange 1 family uses. When a seller combines a name the brand never made with a number that does not sit in the right block, the label was written by someone working from a photo, not from a warranty card.
- Fantasy listing: a watch built to look like a Lange, named after a model that does not exist. Common on marketplace and auction-style platforms.
- Mislabelled genuine watch: a real Lange 1 photographed badly, with a seller guessing at the reference from memory.
- Mislabelled replica: a counterfeit with a plausible-looking caseback engraving and a number invented to fill the space.
How Lange References Actually Work
Lange assigns references in blocks by family, so a Lange 1 and a Lange 1 derivative sit near each other numerically while unrelated families sit elsewhere. The practical consequence is simple: if the name and the number come from different blocks, the listing is already unreliable. The only source of record is the brand's own catalogue entry, which states the model name, the reference, the case metal, the diameter and the movement. Any seller who cannot point to that entry is asking you to trust a caption.
Movement: The Part That Is Hard to Fake
Lange builds its reputation on hand finishing that does not scale down to a counterfeit budget. Look through the sapphire caseback before you look at the dial.
- Three-quarter plate: a large plate in untreated German silver with Glashütte ribbing, not a thin decorated rotor cover or an open skeletonised movement.
- Hand-engraved balance cock: floral scroll cut by hand. Fakes show laser engraving with uniform depth and no variance in the line.
- Gold chatons: screwed gold settings around the jewels, with blued screws whose slots are polished.
- Outsize date: two separate discs for tens and units, jumping as a pair. Cheap copies print the date or use a single disc with a gap.
- Subsidiary seconds and power reserve: the asymmetric layout includes a power-reserve indicator marked with German terms. On replicas the lettering is soft and the subdial spacing drifts.
Ten-Minute Authentication Check
- Ask for the model name and reference in writing, then compare both against the brand's own listing for that family.
- Request a straight-on caseback photo, not an angled one. Reference and serial engraving should be crisp, level and consistent in depth.
- Ask for a macro shot of the balance cock. Hand engraving has uneven depth and visible tool flow.
- Check the date change. A real outsize date snaps as two discs at midnight, not minutes before or after.
- Verify the crown positions. Winding, date setting and time setting should feel distinct on each pull.
- Compare serial and reference against any service paperwork, box label or extract the seller claims to hold.
- Weigh the case in your hand. Gold has a density that steel copies do not match, and the difference shows up immediately against a known weight for the metal claimed.
Red Flags That Point to a Replica
- A model name the brand never used, including any "Lange 2."
- A reference that does not belong to the family named on the listing.
- Photos that avoid the caseback, the balance cock or a straight macro of the date.
- Dial printing with thick strokes, uneven spacing or a logo that sits off the centre line.
- A price far below the working range for the metal and model claimed, with an explanation about a distressed sale.
- Seller language about "mirror quality," "Swiss-grade clone" or "1:1" rather than model and reference facts.
What to Do Depending on Your Situation
You are buying pre-owned from a private seller
Walk away from any listing that cannot produce a reference matching a real model. If the watch is genuine but mislabelled, ask the seller to confirm the true reference and serial, then have a Lange service centre or an independent watchmaker with Glashütte experience inspect it before money changes hands.
You are shopping in the replica market
Treat "Lange 2 401.021" as a made-up product name. Sellers in this space often reuse brand-adjacent wording to sound official. Judge the watch on what is visible: case finishing, dial print, date alignment, strap hardware and the movement behind the glass. Ask for movement photos and a video of the date jumping before you commit.
You already own one
Have a watchmaker open the case. If the movement is a stock automatic with a decorative plate, you own a replica regardless of what the caseback says. If it is a genuine Lange movement, the service centre can confirm the reference from the serial.
Bottom Line
The phrase "fake Lange 2 401.021" describes a product name that does not exist in the Lange catalogue, which makes every listing using it suspect from the first line. Verify the model name against the brand's own reference list, inspect the movement finishing through the caseback, and confirm the serial. If any of those three checks fails, the number on the caseback is decoration, not documentation.