La Joux-Perret G121
Factory specs
- Caliber
- G121
- Made in
- Switzerland
- Frequency
- 28,800 bph (4 Hz)
- Power reserve
- 68 h
- Jewels
- 24
- Hacking
- Yes
- Hand winding
- —
- Accuracy
- —
- Diameter
- —
- Height
- —
- Functions
- Hours, Minutes, Small seconds
- Same family
- La Joux-Perret G100, La Joux-Perret G101, La Joux-Perret G110
Small-seconds member of La Joux-Perret's G100 family (see la-joux-perret-g100), without date. March LA.B, which cases it in the Mansart Petite Seconde (small seconds at 7), gives 24 jewels, 4 Hz / 28,800 vph, about 68h and a stop-seconds; Oracle of Time's review of that watch gives the same calibre, 24 jewels, 28,800 vph and 68h. March LA.B's paragraph also calls it "G120" and repeats the G100's 24.6 x 4.45mm and 280 components, so dimensions aren't recorded. MLJP's own site couldn't be reached on 2026-10-30.
Watches with the La Joux-Perret G121
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 March LA.B Mansart Petite Seconde |
$2,071 | La Joux-Perret G121 | 35 | 11.1 | Sapphire | — |