This watch strap from the German maker Pebro is distinguished first and foremost by its generous proportions.  It has thick rounded, padding and contract cream stitching that really makes it stand out on the wrist.
 

This watch strap features a 'worn' vintage look calfskin leather.  It is subtly embossed to give it a complex and unique grained texture. 
The strap is also fitted with a soft underlining lining to make it comfortable to wear all day and a solid, chunky steel buckle that complements the casual style of this strap 

Size:  20mm at the watch end, tapering end  to 18mm at the buckle