Mikrolisk gives Perseo (with a three star logo, as yours has on the dial) as being a subbrand of Cortebert, a renowned watch manufacturer. In view of the fact that Cortebert made their own movements, including pocket watch movements, it is a little surprising that, going by the shape of the balance cock, it isn't one of their own movements inside but rather what looks like an Unitas, e.g.:
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