MEMOSAIL countdown timer chronograph for yacht racing. The movement is a Valjoux 7733 manual winding, and the highly visible large dial and coloring are eye-catching even for everyday use. MEMOSAIL is a brand of the 1970 Swiss Ebauches yacht racing watch, the Aristo model. When the chrono button is pressed, the red chrono hand moves and the yellow desk starts to rotate backwards, and START is displayed after 10 minutes. There are scratches around the back of the case due to hard use, but there are no problems with the mechanism, and it was overhauled last year by a professional watch repairer. You can use it with confidence. The case diameter is 45mm wide and 13mm thick. The current strap is a new aftermarket one, but I will also include the original urethane strap. However, the original strap has a crack of about 5mm wide at about 43mm from the tip of the hole side due to use. I think this is the MEMOSAIL first model, which is not often seen.