This is a Seiko watch strap, 20mm lug width, made of stainless steel. The flush fit is aftermarket. It's a somewhat sturdy strap, so it would likely suit Seiko divers or field watches. There are some minor scratches from use. Ultrasonic cleaning has been performed prior to listing, but please refrain from purchasing if you are looking for new condition. Thank you. - Material: Stainless steel - Manufacturer: Seiko - Width: 20mm lug width, aftermarket flush fit. Thank you for viewing. Please feel free to ask any questions. Thank you. Color: Silver系 (Silver-toned) #SEIKO #WatchStrap #20mm