+/- 5-10 seconds a day. This is a very rare matte black dial. Unpolished condition, which is rare for these vintage AirKings.Case is at 34.5mm. Let me know if you have any questions. Its a great watch but just a few mm too small for my wrist. The item "Vintage Rolex 5500 Air-King Precision Rare Matte Black" is in sale since Thursday, March 26, 2020. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Wristwatches". The seller is "2015uswarpi" and is located in Arlington, Virginia. This item can be shipped to United States.