I have this watch that I wear everyday to studio. It has been through a lot with me—you can tell from the cracked screen and I totally wore out its strap. So I decided to handmade a leather strap to keep this watch on duty.Cut the strap and skive the end.
Punch hold for hardware and ready for glue. Glued and clamped.

One round of stitches.
Cut extra wide strap keeper (which I prefer from user experience). Add one stamp to make it unique. There, the long strap is one piece so it also covers the back of the watch, which makes it more comfortable to wear and temperature insensitive.