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looks similar like the OP XXX,
It is unclear which basis the movement has, properties fits perfect to a Valjoux 7750 caliber, but the OP XXXI has like the OP XXX a balance bridge and not like all 7750s 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.
|Basis||Valjoux 7750 or ValFleurier?|
|Dimension||29,89 mm (13 1/4''')|
|Frequency||28.800 vph (4 Hz)|
|Power Reserve||50 h|