“The small pocket in jeans, often referred to as the "watch pocket" or "coin pocket," was originally designed to hold pocket watches. Nowadays, it's commonly used for carrying small items like coins, keys, or other small objects.”
I really like pocket watches and have tried them out. Skeleton pocket watches are beautiful but kind of hard to read. Main issue is that they are usually mechanically spring powered which requires proper winding technique and doing it frequently.
I carry an electronic pocket watch everywhere i go. It's replaced the wrist watch for me. It's too big to fit in that pocket though, that's where i keep my weed.