Pocket Watch Necklaces

I was innocently browing urban outfitters when I stumbled across a pocket watch necklace. 90 minutes and several etsy and dawanda shops later, I have fallen in love. How useful and beautiful are these? I also love the vintage feel these have.

1pc antique copper vintage pocket watch by uniquekingdom

 Antique Bronze Pocket Watch Necklace and Roman Miniature Silver Pocket Watch Necklace, 

both by AnaloguePeople

Dusk in Wonderland, by birdzNbees

Double Chain Watch Necklace, by Urban Outfitters

We pass time, by ninushka

Of course, there's also some rather cutesy and some more steampunk takes on this theme.