La Joux-Perret L100
Factory specs
- Caliber
- L100
- Made in
- Switzerland
- Frequency
- 28,800 bph (4 Hz)
- Power reserve
- 60 h
- Jewels
- 26
- Hacking
- Yes
- Hand winding
- —
- Accuracy
- —
- Diameter
- 30 mm
- Height
- 7.9 mm
- Functions
- Hours, Minutes, Small seconds, Chronograph, Date, Day
Citizen-owned La Joux-Perret's column-wheel automatic chronograph, sold as a drop-in alternative to the Valjoux 7750 (MLJP lists dimensional compatibility with the ETA 7750 and Sellita SW500). MLJP product page for the L100 itself: tri-compax with day and date, 30-minute counter at 12, 12-hour counter at 6, small seconds at 9, day and date at 3; Ø30.00 x 7.90mm (encasing diameter Ø30.40mm), 4 Hz, stop-seconds, 60h power reserve, unidirectional automatic winding ("Manuel en option": a hand-wound version is offered, 24 jewels against 26 for the automatic). L100 is also the name of the family: MLJP sells the same base as L101 (tri-compax, date), L102 (tri-compax, no date), L110/L112 (tri-compax 3/6/9), L111 (bi-compax 3/9 with date at 6), L113 (bi-compax 3/9 without date), L120-L122 (with a GMT hand) and L1C0 (retrograde seconds and date) (layouts per MLJP's menu and Caliber Corner; the L101, L111 and L113 product pages give the same 4 Hz, 60h and 7.9mm height as the L100). MLJP's 2021 announcement (via Watch I Love) gives the same figures and says the power reserve was raised to 60h while costs fell by about 25%. Some watch brands quote 68h for their L100 (the G100's figure) and bi-directional winding; MLJP states 60h and unidirectional winding. MLJP does not publish accuracy figures or grades on the product page, and whether the automatic version can be wound by hand is not stated. Not a 7750 clone: MLJP's own construction with a column wheel, only dimensionally compatible.
Watches with the La Joux-Perret L100
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 Zelos Vitesse Forged Carbon |
$1,499 | La Joux-Perret L100 | 40 | — | Sapphire | no bracelet |
 Zelos Vitesse SS |
$1,499 | La Joux-Perret L100 | 40 | — | Sapphire | — |
Sources
- Manufacture La Joux-Perret, L100 product page (tri-compax with day and date)
- Manufacture La Joux-Perret, L113 product page (bi-compax without date)
- Watch I Love, MLJP announcement of the G100 and L100 with 60h+ power reserve (17 June 2021)
- Caliber Corner, list of La Joux-Perret movements (L100 family layouts)