Up for auction is this amazing Pryngeps Regolo Formula 1 Triple Calendar. A vintage piece with a very rare Regolo bezel scale. Designed for measuring vehicle fuel efficiency, calculating how many miles a vehicle can travel with a set amount of fuel consumption (litres per 100 km). CONDITION OF THE WATCH: - The watch is in almost new condition. The only marks are from opening the back case. - Triple calendar with month, day of the week and day of the month - Formula 1 car silhouette engraved on the back case - Details and full-resolution pictures can be found at https://www.mwatchcollection.com/collection/Pryngeps/Pryngeps%20Regolo%20Triple%20Calendar INFORMATION ABOUT THE WATCH: - Swiss Made Caliber France Ebauche FE 5 Jewels, Quartz, triple calendar - 18mm Leather strap, strong Yellow from Morellato. Normal clasp. Used but in good condition. - Case with ~36mm diameter and ~9mm thickness. Detailed wings. Gold-plated bezel. - Mineral Crystal without any marks - Blue metallic dial with detailed indices DELIVERY: - The delivery will be done by registered mail (Tracking registered number) - Shipped by the Portuguese national carrier CTT. - The blue box is only for pictures and is not included. The watch is sold in a normal paper box Please carefully read this description and view ALL the photos. They are part of the auction and properly describe the item.