How do you remove a leather watch strap?

The leather strap is held to the watch case by a metal shaft with a pin at each end. The pins fit into holes in the case. If you look closely at the side of the case you will usually see a tiny hole. You can push the pin through this hole to compress it, and the shaft will pop out. One warning -- once the pin is out of the case, it's easy to lose. I suggest working over a tray or a large sheet of paper. If you bought a new strap, the salesperson will usually change the strap for you. You can also take it to a jeweler.