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The name “Landeron L72” can point to a modern automatic chronograph, while “Landeron Caliber 72” usually refers to a separate vintage, hand-wound movement. They are not the same caliber. Check the watch reference and movement marking before identifying a watch, ordering parts or arranging service.
Two different movements share similar names
Movement-reference sources associate the modern Landeron L72 with the Timex Atelier M1a Ti references TW6A02700 and TW6A02800, describing it as an automatic bi-compax chronograph. The vintage Landeron Caliber 72 is a manual-wind chronograph. The similar numbers are not enough to identify which movement is in a particular watch.
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The available references do not include a primary technical sheet for the modern L72, so its detailed specifications should not be inferred from information about the vintage Caliber 72.
Vintage Landeron Caliber 72: reported specifications
Secondary movement references describe the vintage Caliber 72 as a Swiss-made, 17-jewel, manual-wind chronograph. Its chronograph is reported to use a column wheel and horizontal clutch; one specialist reference specifies a three-column wheel. These are reference-source specifications, not a manufacturer-confirmed specification sheet.
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| Feature | Reported detail |
|---|---|
| Winding | Manual |
| Chronograph mechanism | Column wheel with horizontal clutch; one specialist reference describes a three-column wheel |
| Display | Central hours and minutes, central chronograph seconds, small seconds at 9 o’clock, and a 30-minute chronograph counter at 3 o’clock |
| Diameter | 14 lignes, approximately 31 mm |
| Height | 5.9 mm |
| Jewels | 17 |
| Rate | 18,000 beats per hour (2.5 Hz) |
| Power reserve | One reference estimates approximately 40 hours; this is not a manufacturer-confirmed figure |
| Shock protection | Incabloc is reported as version-dependent |
These figures come from secondary movement references and may not describe every variant. Confirm the specific movement before using a specification for repair, parts selection or a watch listing.
Production dates are approximate
Specialist references place the vintage Caliber 72 in the 1940s and 1950s, with one estimating circa 1949–1955. A community movement database instead lists 1962. The available references therefore do not establish a single settled production date; avoid assigning a precise year based on the caliber name alone.
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How it fits into Landeron’s chronograph history
A specialist history traces Landeron to the Hahn family business in Le Landeron, Switzerland, and says the firm was producing chronographs by 1923 at the latest. It describes the Caliber 47 in 1937 and its two-pusher Caliber 48 successor as cam-operated chronographs. That background should not be confused with the vintage Caliber 72, which movement references classify as a column-wheel design.
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Confirm the movement before ordering
- Check the case or dial reference and look for a movement marking; do not identify the caliber from “L72” or “72” in a search result alone.
- Have a watchmaker confirm the caliber and variant from the movement itself, especially if markings are worn or the watch has been modified.
- Give the confirmed caliber and, where available, the watch reference to a parts seller or repairer before agreeing to a purchase or service.
Treat parts listings as leads, not fit guarantees
A community movement database reports catalogued compatible parts and donor-movement sourcing for the vintage caliber. That does not establish present stock, confirm that a particular component fits every variant, or verify a specific supplier. Ask a specialist to check the exact movement and part before buying; a donor movement may also need inspection for condition and compatibility.
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