This is a restored, working "A258-5030" released by SEIKO in 1980. When purchased, this unit had battery leakage inside and seemed unusable. Therefore, the module has been completely replaced with one from a working, identical model. Since the module has been replaced with a working one, all functions are currently operating without problems. However, this item has been completely disassembled during the restoration process, so please refrain from purchasing if you are resistant to restored/repaired items. The original XR9527W battery is discontinued and difficult to obtain, so a working SR927W has been installed. It is rumored to have a shorter lifespan compared to the original, but it seems to be working without any issues for now. The case is in quite good condition considering the years since its release. The belt is not original, but a SEIKO vintage item manufactured around the same time has been installed. This is also in good condition, but please check the photos for detailed exterior condition. This is a beautiful, working A258-5030 that is rarely seen. If you were looking for one, please consider it. ✳︎Before purchasing✳︎ This is a precision instrument that is almost 45 years old since its release. There is a possibility that it may suddenly stop working during use, so please purchase only if you understand that it is "junk that is usable at the present time." We do not accept refunds or returns under any circumstances after shipping, so please understand. We also decline purchases from those who seek a like-new condition, are sensitive, or are resistant to restored/repaired items. Please feel free to ask if you have any questions. Thank you. #Seiko #Retro #80s #70s #Vintage #A258 #SEIKO #80s #70s #vintage