The watch houses a Valjoux 55 VBR movement found in other rare watches from brands like Minerva. Fans of vintage watches also probably know link the 55 VBR from the eight surviving known Rolex ref. 4113, the only rattrapante wristwatch Rolex ever produced. The Universal movement also had a 16-minute totalizer, unlike the more common 30-minute counter, and comes relatively link unfinished. But it's still a hell of a watch and a bargain when it comes to watchmaking and history if you link can find one.