OP XXX
hours, minutes, small seconds, date
170 parts,
Basis is a ETA 7750 w/o Chrono module?,
successor of OP III,
COSC Certified,
It is unclear which basis the movement has, properties fits perfect to a Valjoux 7750 caliber, but the OP XXX has a balance bridge and not like all 7750’s a balance cock!
On the base plate is the engraving “MVB” visible, that is typical naming for caliber from Richmont group. Because of that we tend to ValFleurier as producer.
| Label | Value |
|---|---|
| Model | OP XXX |
| Winding | Automatic |
| Basis | Valjoux 7750 or ValFleurier? |
| Producer | Horlogère ValFleurier? |
| Introduction | 2017 |
| Dimension | 29,89 mm (13 1/4''') |
| Frequency | 28.800 vph (4 Hz) |
| Power Reserve | 50 h |
| Jewels | 25 |
| Height | 7,90 mm |
(Image source: Bebbe (forum member))
(Image source: Panerai)