Approximately 3.4cm wide. This is an extremely rare model, with a low production number, making it difficult to find. Up for sale is a Seiko Surftimer 100m quartz men's watch. There may be minor scratches and clear marks from use, including on the glass surface, but I don't think there is any severe damage. Please examine the images carefully. The belt has been replaced with a Seiko genuine urethane diver's belt. *I will also include the rare original belt from that time, but it is an old belt with age-related deterioration, so it is just an extra. As it is an old quartz watch from the 80s, I cannot guarantee future operation, but it is currently working without any problems (I don't know until the next battery change... Also, I do not perform maintenance or adjustments such as OH, so the condition may change *This is because there is always a risk with mechanical items). Of course, the crown operation, screw-down crown, rotating bezel, and alarm switch (sound also works) are all currently working without any problems... *It can be used normally as a watch, but if you are concerned about the waterproof performance, please have it serviced and overhauled. It is a very rare working watch, but it is an old, used item that has been in someone's hands. Please consider purchasing if you understand that it is a used item. If you are not familiar with used items, are nervous, or do not understand the above explanation, or are anxious, please do not buy it. Mercari is a place for personal sales. It is a used item in its current condition, and it is a layman's inspection (there is absolutely no 100% perfection), so please understand. The only accessories are the original belt, which is treated as an extra, as shown in the image. Ultra-ultra-rare watch! It's a Seiko Surftimer 100m quartz men's watch!! I hope you will cherish it. *I will ignore and delete consultations using Mercari's standard phrases without price offers and price negotiations that lack common sense. Also, please refrain from unnecessary "likes" (it is a factor in withdrawal). #Seiko #SEIKO #SeikoDiver #SeikoDivers #DiverWatch #DiversWatch #SeikoProspex #SeikoProfessional #SeikoLadiesDiver #SeikoDiver150m #SEIKODiver #SEIKOSCUBA200m #SEIKOSCUBA #PROFESSIONAL #SEIKOPROFESSIONAL #DiverScuba #SeikoSurftimer #SEIKOSURFTIMER