Battery replaced. Running normally. Vintage Seiko Tank 9520-5090 SGP+PDP Gold plated + Palladium plated Quartz Vintage Seiko Tank Square, rectangular Swiss-made exterior Men's wristwatch With new strap Case: Approximately 35mm long x 26mm wide (excluding the crown) Lug width: 18mm SWISS ACM: It is presumed to refer to "SWISS ACM Id Accessory and Case Manufacture." It seems that Seiko used this notation for watches that combined Japanese quartz movements with Swiss-made cases and accessories. Seiko acquired "Jean Lassale," a Swiss luxury watch brand known for its ultra-thin movements. However, Seiko did not acquire the rights to Jean Lassale's original mechanical movements, and those rights are currently held by Piaget. Therefore, this model was born with a Swiss-made case and a Japanese-made movement. This is a very rare piece historically. (Internet information) This product shows signs of aging. There are scratches on the glass surface, and a slightly large rust spot on the outside of the case at the 10 o'clock position. Please refrain from purchasing if you are concerned about minor imperfections, as this is a used item. The price of tank designs, Roman numeral indices, and square-shaped watches in general is rising. How about taking this opportunity? This is a vintage item, so it may require an overhaul. Please refrain from purchasing if you are concerned about minor imperfections, as it is an old item with some aging. Due to being a one-of-a-kind, vintage item, we do not accept returns or complaints to prevent parts swapping. Please purchase if you agree with the above.