This Super-O Boyer watch band with a curved solid end pieces perfectly fit Seiko Automatic Alpinist Watch SARB013, SARB015 and SARB017 models. Super-O Boyer watch band is a new breakthrough of our O Boyer Collection. Same as O Boyer, this Super-O Boyer composed of 3 flat and solid 316L stainless steel units plus highlighted 3D effect curved solid end pieces. This well-built replacement bracelet was assembled by screw-in adjustable details instead of flimsy pressure pins. Watch band is tapering to 18mm buckle width. (Compatible with original Seiko 18mm buckle, if you want to install your original Seiko clasp, please checks the size of your Seiko clasp first.) This item includes one pair of FAT spring bar (Generic Seiko Dia. 2.0mm spring bar) to ensure a more secure connection. Accompany with V-Clasp double lock buttoned diver's clasp. V-Clasp was made from solid 316L stainless steel with extra 6 micro holes for flexible fine tune length adjustment. Featured in V shape safety lock, streamlined form & chamfer edged design to giving a more massive look. Chamfer double locks diver's buckle is ideal for a watch band with thickness approximately 3.5 - 5.0mm thickness. This Super-O Boyer watch band is a good choice of Seiko replacement watch band for your Alpinist SARB013, SARB015 and SARB017 models.