Very Nice Croton Chronomaster Aviator Sea Diver.  Runs well, Chrono functions well. Lug width is 19mm. Watch Diameter is 38mm without crown.VERY IMPORTANT:  I do not know the service history on this watch. When I received it, I wound it and set the time. The watch works and performs well but is NOT guaranteed for accuracy or reliability. All vintage watches should be serviced before daily use. Vintage watches should NEVER be subjected to water unless checked out by a watch maker.  Please examine pictures carefully and ping me with any questions.  All items are as pictured, used and sold as is, with no warranty, expressed or implied. No returns are accepted, so please ask questions before you bid. I do not represent any of the manufacturers of the products listed.   Flat rate Shipping quoted is for CONTINENTAL US ONLY. All related shipping costs, import fees, customs fees, etc are the responsibility of the winning bidder. International winning bidders will receive an invoice from me once I determine shipping costs. All customs documentation will reflect actual items and values.  All Items are sent USPS Priority with Signature required and insurance value set at purchase price.   NOTE TO INTERNATIONAL BIDDERS: The buyer is solely responsible for payment of any and all customs duties, taxes, or fees levied by their home country.  Furthermore, the buyer is responsible to determine whether the item they are bidding on can be legally imported into their country.  I am not responsible for customs seizure or other package loss outside USA.  Please allow adequate time for customs clearance.    Please check my other auctions.   Good luck.