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Lange finishing is the authentication. The hand-engraved balance cock is unique to each watch, so two examples with identical engraving cannot both be real.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Balance cock engraving | Hand-engraved in a floral pattern, individual to the watch, with visible variation in depth and line | Machine-uniform engraving, or a pattern identical to another example you can compare against |
| movement | Three-quarter plate and chatons | Untreated German silver, which warms in tone with age rather than staying bright, with screwed gold chatons and blued screws | Rhodium-plated brass staying uniformly bright, or chatons pressed rather than screwed |
| dial | Dial layout | Silver ("Argenté") dial, Arabic numerals, railway-track minute scale, subsidiary seconds at 6 and no date anywhere | A date window, a power-reserve indication or a running-seconds hand at the centre. All belong to other 1815 references |
| movement | Calibre and reserve | L051.1, manual wind, 21,600 semi-oscillations per hour, 55 hours from full wind, 188 parts | A 72-hour reserve, which is the 34mm L152.1, or any automatic rotor |
| case | Case size and material | 38.5mm in 18k white gold, water resistant to 3 bar | A 34mm case being sold as this reference, or steel, which Lange does not use for the 1815 |
