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Girard-Perregaux caliber 8381 is a manual-wind chronograph movement that secondary sources associate with the Richeville chronograph and describe as based on the Lemania 1872. The most useful editorial record is a 2006 correction from Fratello Watches, which withdrew its earlier claim that the movement was in-house. The technical figures in circulation come from a repair-oriented blog rather than from a Girard-Perregaux document, so they should be read as reported specifications, not factory data.
Where the movement comes from
Fratello Watches published an article titled “Girard-Perregaux caliber 8381” on January 31, 2006. Its editor, Robert-Jan Broer, later corrected the earlier description of the movement. The correction reads: “This movement is not inhouse as I wrote, but it is based on the Lemania 1872.” That makes the Lemania 1872 lineage the most specific origin claim on record for this caliber.
The correction is an editorial statement, not a statement from Girard-Perregaux. No first-party Girard-Perregaux statement on the origin of caliber 8381 was located, so readers should attribute the Lemania link to Fratello’s correction and not to the manufacturer.
Watches reported to use it
Secondary sources connect caliber 8381 to Girard-Perregaux’s Richeville chronographs. A repair-oriented page, published by the Japanese watch repair shop dtk時計修理 on Ameba under the title “Cal. 8381 Girard Perregaux (Lemania 1872)”, names the Richeville reference 2710. The page does not carry a publication date in the retrieved copy, so its currency cannot be fixed.
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Reference 2710 is the only specific model reference reported for this movement. No other references were established, and the link between that reference and the caliber has not been checked against Girard-Perregaux catalogues. Treat it as a lead to confirm, not a settled match.
Reported specifications
The table below reproduces the figures from the dtk時計修理 page. Every value comes from that single secondary source.
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| Attribute | Reported value | Source status |
|---|---|---|
| Winding | Manual | Secondary repair blog only |
| Function type | Chronograph | Secondary repair blog only |
| Chronograph scale | 60-second | Secondary repair blog only |
| Chronograph counter | 30-minute | Secondary repair blog only |
| Other indication | Small seconds | Secondary repair blog only |
| Seconds-stop | No seconds-stop function, per the page | Secondary repair blog only |
| Diameter | 27.5 mm (12 lignes) | Secondary repair blog only |
| Height | 5.7 mm | Secondary repair blog only |
| Beat rate | 21,600 beats per hour | Secondary repair blog only |
| Jewels | 17/18, as printed on the page (exact count not confirmed) | Secondary repair blog only |
| Power reserve | 48 hours | Secondary repair blog only |
The table is a useful working reference for a collector or repairer, but the blog does not say how it obtained the measurements. A diameter and height could be read from a movement, while a jewel count and power reserve normally require either documentation or a test on the movement itself. Until those figures are checked, they should be presented as reported.
What is not established
- Official specifications. No Girard-Perregaux specification sheet, service manual, or parts list for caliber 8381 was located.
- Variants. No separate caliber 8381 variants were established, so a comparison between versions would be unsupported.
- Parts compatibility. The Lemania 1872 lineage does not establish that parts from other Lemania-derived movements will fit. Compatibility should be assumed only after confirmation against a reliable parts reference.
- Related calibres. The same blog mentions comparisons with the Omega 860/861 family. The exact relationship was not verified from an authoritative source, so it should not be taken as a technical equivalence.
- Statistics. No published figures, studies, or market data about caliber 8381 were located. The numbers above are technical specifications from one blog, not organisational data.
How to check a caliber 8381 watch
- Compare the dial and caseback markings with Girard-Perregaux and Richeville branding. Note any reference number printed on the case, caseback, or paperwork.
- If the reference is 2710, treat that as a match worth confirming, not as proof that the movement is a caliber 8381.
- Have a qualified watchmaker open the movement and check the jewel count, diameter, height, and beat rate against the figures in the table above. A timing machine reading will show the actual beat rate.
- Contact Girard-Perregaux directly with the serial number and reference, and ask whether it holds documentation for the movement. Do not assume the brand will provide technical data on a particular caliber.
- Before ordering any part, confirm the part number against a reliable source. Do not rely on the Lemania 1872 link alone.
A watchmaker who works on vintage Girard-Perregaux or Lemania-based chronographs is the most practical route for servicing or confirming a particular watch.
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Fratello’s 2006 correction is the most specific origin statement available, and the dtk時計修理 page is the only source for the technical data and the Richeville reference. Each should be cited with its author, date, and limits.
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