ONE Factory Bulova Watertite Crown #318 - White

ONE Genuine Factory Bulova Watertight Crown, marked Bulova, #318, White gold fill, new in package,  Look to be about 4mm or so in diameter. Notably, Bulova called these Watertite, not waterproof. I also personally find the packaging to be quite annoying as any attempt to open almost always it results in the contents being flung across the room. Images do a barely adequate job of representing the item.