Seiko Automatic Divers 23 Jewels 100m Made in Japan SNZF17J1 SNZF17J SNZF17 Mens WatchSeiko 5 Sports Automatic 23 Jewels Japan Made SNZF17 SNZF17J1 SNZF17J Men's Watch This 23 jewel, mechanical marvel from Seiko runs on a traditionally built mechanical, automatic movement, much like in the most expensive, commercially produced mechanical watches from all over the world. The watch self winds when subjected to physical movements and the seconds hand sweeps rather than ticking like in cheap quartz. It is built to last.