Best straps for the Seiko Prospex
20 mm lugs, 40.5 mm case, reference SPB143. Try a strap below; the drawing is to scale.
Strap
Colour: Steel
Strap width20 mm
At the buckle16 mm
Lug to lug47.6 mm
Looks that work on the Seiko Prospex
Strap size for the Seiko Prospex
What size strap fits the Seiko Prospex?
The Seiko Prospex takes 20 mm straps: its lug width is 20 mm. A leather strap will usually taper to 18 mm at the buckle.
How big is the Seiko Prospex?
The case is 40.5 mm across, and about 47.6 mm from lug tip to lug tip.
What strap looks best on the Seiko Prospex?
Good options are a black rubber strap, a black and grey stripe NATO strap, a taupe suede strap. Try them all on the drawing above.
Sizes come from published specs. Check yours before you buy: how to measure lug width.