ELGIN Jumping Hour Golf Ball Iron Mask. This is a Road Elgin, famous for Elvis Presley's use of a jumping hour watch. The "Golf Ball" model is particularly rare due to its round iron mask and the reluctance of golf ball collectors to part with it, making it rarely seen on the market. The well-balanced, small case, despite being American-made, fits Japanese wrists well, which may be a reason for its rarity. The Tenderloin's square shape has a lug width of 19mm, while the Golf Ball's round shape has a lug width of 16mm. The exquisite dot finish, befitting its "Golf Ball" name, gives it an elegant impression. The case back reads "10K RGP BEZER," indicating a bezel-integrated hooded case, suggesting the entire case top is 10K plate. Accuracy and Size: Accuracy: Within 1-2 minutes per day (consider position error) Lug width: 16mm Case width: 30mm (excluding crown) Vertical diameter (including lugs): 37.5mm Thickness: 9.5mm The strap is aftermarket. There are scratches and blackening due to aging. We are pleased to introduce a unique wristwatch from the American watchmaker "Elgin." This is a model commonly known as a "Jump Hour," where a resin disc rotates instead of the usual hour and minute hands, displaying the numbers directly. This particular model is commonly called the "Golf Ball." The case is characterized by many small holes on the front, which is why it's called the Golf Ball. It has a snap-back case, but it has a packing inside to improve airtightness. The gold-plated case shows some signs of use, but overall, it is in good condition. The hand-wound movement is housed in a round case, but it is square. Although it has a basic construction, it features a shock-resistant mechanism and is multi-jeweled to keep the oil in good condition. There is no significant damage overall, and the condition is good. It may not be a mainstream watch, but this type of mechanical digital watch is one of the models that cannot be left out when talking about the history of wristwatches.