I have an old Seiko and it needed a band that just wasnt as wide as today's watches have. I found this one online and I think it looks amazing with my old Seiko
A friend recommended Holben’s as a great alternative to high quality leather straps for dress watches and they were right. They are my go-to straps when changing my straps for my dress watches for work and special events. The quality and aesthetics of the strap are also superb and top notch.
Hadley-Roma makes fantastic straps. I bought straps for 150 dollars and the Hadley-Roma for under 20 dollars has better craftsmanship.