Jack Mason Men Wristwatches for sale | eBay。The Jack Mason JM‑A103‑005 Automatic Watch is a rare and stylish timepiece featuring a sleek black stainless steel case with a silver bezel. It boasts a self-winding mechanical movement with 24 jewels, water resistance up to 100m, and a 5-year manufacturer warranty. This men\'s watch comes with a two-piece leather strap in brown, Arabic numeral indices, and a screwback caseback. Presented in its original box and papers, this round-casified watch is perfect for casual wear and is handmade in the United States by Jack Mason.