Short answer
The first tell on a fake Saxonia Date is the outsize date itself. A. Lange & Söhne builds that window from two separate discs under one opening: both digits sit on the same baseline, the gap between them stays even, and the change happens in one jump at midnight. Copies use a single printed disc or two thin wheels, the digits ride high or low, the gap wanders, and the date crawls over across an hour or more. The second tell is the movement. Genuine Lange calibres show Glashütte ribbing on an untreated German silver plate, screwed gold chatons, blued screws and a balance cock engraved by hand. A fake carries a decorated rotor on top of a basic automatic movement.
Prerequisites
- A 10x jeweler's loupe or a macro lens
- Digital calipers
- A scale that reads to 1 gram
- Published reference photos of the exact model you are viewing
- A watchmaker or authorized dealer lined up for a final check
Step by step check
- Read the reference number on the caseback and confirm it matches the dial layout in front of you.
- Measure the case across the bezel and compare the result to the published spec for that reference.
- Set the watch on a gram scale. A gold Saxonia Date head with a leather strap lands in the 80 to 100 gram range in most cases, while a steel or plated copy comes in lighter.
- Loupe the date opening and check that both digits sit on one baseline with an even gap between them.
- Set the date to the 30th, then wind past midnight and watch the change. The genuine mechanism snaps over in one motion.
- Turn the watch over and study the surface finish. You want Glashütte ribbing, not circular perlage or bare metal.
- Find the balance cock and look for freehand engraving. Each one is cut by hand, so no two are alike.
- Inspect the screws. Lange uses blued steel screws and screwed gold chatons around the jewel bearings.
- Check the dial text and minute track with the loupe. Real printing is sharp and unbroken, and applied markers are solid gold with crisp facets.
- Compare the hands. Genuine hands are polished on every facet with sharp edges. Copies show rounded tips and burrs.
- Check the caseback engraving. The reference, the serial and the country of origin should be crisp and deep.
- Photograph the movement, the caseback and the serial, then send the images to an authorized dealer or a watchmaker trained on Lange.
- Compare the asking price to live listings for the same reference. A price far under the going band points to a copy.
Red flags
- Date digits of different heights or a gap that widens toward one side
- A date disc that shows through the dial edge or sits under a printed frame
- Rotor engraving that reads as machine stamped, with shallow repeating lines
- Screws that are polished steel instead of heat blued
- Dial text with thick strokes, blurred edges or a broken minute track
- Case metal that feels light in the hand and shows plating wear on the lugs
- No service history, no box, no papers, and a seller who avoids a watchmaker inspection
Verification and paperwork
Ask for the original papers and match the serial on the caseback to the number on the certificate. Lange keeps service records, and an authorized dealer can confirm a serial and pull the service history. If the seller blocks that step, walk away. Counterfeit branded goods are illegal to sell in the United States and can be seized in transit, so a deal that depends on speed and secrecy is a deal you do not want.