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A. Lange & Söhne Langematik Perpetual
Reference 310.025 E. A sheet to take with you: the numbers to check the watch against, what to look at, and what to ask. It does not authenticate anything and it does not tell you whether to buy.
Check the numbers
Measure or ask. A watch that does not match these is not necessarily wrong, but it is a question worth the answer.
| Case width | 38.5mm |
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| Thickness | 10.2mm |
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| Lug to lug | the brand publishes none |
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| Strap width | not recorded |
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| Water resistance | not recorded |
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| Case material | platinum |
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| Crystal | not recorded |
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| Bezel | not recorded |
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| Produced | 2001–2021 |
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| Movement | A. Lange & Söhne Cal. L922.1 Sax-0-Mat: in-house automatic, 21,600bph, 46h PR; ZERO-RESET seconds, 5.7mm movement height, perpetual calendar with outsize date and a moon phase accurate to one day in 122.6 years |
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Anything above marked not recorded is a gap in this catalog, not a property of the watch. Do not read a blank as a zero.
Before anything else
A discontinued platinum perpetual calendar is bought on condition and completeness rather than on the risk of a fake, and the outsize date is the part that most rewards a close look.
What to look at
- dial Outsize date alignment
Correct Both date discs sit level with each other and centred in the frame, changing together and instantaneously
Red flag Discs at different heights, a numeral clipped by the frame, or a date that crawls over several minutes
- case Case edge definition in platinum
Correct Crisp transitions between polished and brushed surfaces, with lug edges still sharp
Red flag Softened or wavering edges and a uniformly bright case, both signs of repeated polishing
- movement Caliber L922.1 Sax-0-Mat and ZERO-RESET
Correct Pulling the crown resets the seconds to zero instantly; the movement is finished with Glashütte ribbing and a hand-engraved balance cock
Red flag Seconds that free-run with the crown out, or an engraved balance cock whose cut looks stamped and uniform
- dial Calendar and moon phase coherence
Correct Day, date, month, leap-year and moon phase all agree with each other and with the real date
Red flag Indications that cannot be reconciled by setting, which points to a calendar mechanism out of phase
Known issues on this reference
- The main corrector at 10 o'clock advances every calendar display together. Using the individual correctors out of sequence, or correcting during the midnight changeover, is how these get damaged.
- Platinum shows handling marks readily and polishes away quickly. A case with soft, rounded edges has lost material that cannot be put back.
- Completeness matters disproportionately here: the correcting stylus, the box and the certificate are frequently missing on a watch that has changed hands several times.
Parts that are commonly replaced
- Straps and buckles are routinely replaced. Confirm whether the deployant is the original Lange part, since it carries real value on a platinum watch.
- Crystals are replaced after impact; a correct Lange sapphire sits flush with no visible bevel difference.
Ask the seller, whatever the watch
- When was it last serviced, by whom, and is there paperwork?
- Has the case ever been polished?
- Which parts are not original to it?
- Do you have the box, papers and the original bracelet or strap?
- Why are you selling it?
- Can I see it in daylight, and can I take a photo of the caseback?
What this sheet is standing on
The specifications above are sourced to alange-soehne.com, watchesbysjx.com. What else the catalog does not know.
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