La Joux-Perret F100
Factory specs
- Caliber
- F100
- Made in
- Switzerland
- Frequency
- 21,600 bph (3 Hz)
- Power reserve
- 192 h
- Jewels
- 33
- Hacking
- No
- Hand winding
- Yes
- Accuracy
- —
- Diameter
- 33 mm
- Height
- 4.5 mm
- Functions
- Hours, Minutes, Small seconds, Date, Power reserve
Citizen-owned La Joux-Perret's own hand-wound 8-day caliber. MLJP product page ("8 jours, avec date, petite seconde, indicateur de réserve de marche de 8 jours"): Ø33.00 × 4.50mm, casing diameter Ø32.40mm, 3 Hz, no stop-second ("Stop seconde: Sans"), 8-day power reserve, manual winding, 33 jewels; 270° power-reserve indicator at 12, small seconds at 6, date at 3 or 6. The power reserve is given as 8 days; 192h is 8 × 24, the figure Zelos quotes. The product page's images are labelled "7500", matching the "LJP7500" reference Monochrome uses for the base of the Zelos Mirage 8 Days (2021), whose customised, skeletonised version Zelos lists as 32.4mm × 4.8mm, 33 jewels, 21,600 vph, 8 days / 192 hours, twin barrels, Glucydur balance, Anachron balance spring and Nivaflex mainspring, without the date. MLJP does not state the barrel layout or balance materials for the base caliber, and publishes no accuracy figures or grades.
Watches with the La Joux-Perret F100
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 Zelos Mirage 8 Days Titanium |
$3,900 | La Joux-Perret F100 | 42 | 13 | Sapphire | — |
 Zelos Mirage 8 Days Tantalum |
$4,900 | La Joux-Perret F100 | 42 | 13 | Sapphire | no bracelet |
 Zelos Mirage 8 Days ZircTi |
$4,900 | La Joux-Perret F100 | 42 | 13 | Sapphire | no bracelet |
 Zelos Mirage 8 Days Sapphire |
$8,900 | La Joux-Perret F100 | 42 | 13 | Sapphire | no bracelet |