I recently bought pear necklace that says same as this. Only pat
Clasp Clues for You by: Yvonne
PAT stands for PATENT and usually refers to the right granted to anyone who invents any new, useful, and non-obvious process, machine, article of manufacture. The Jewelry manufcturer has a copyright on the design of the clasp. I woud say this bracelet is manufactured as there is no Patent number.
Clasps and jewelry findings provide a wealth of dating informatio. A great resource on clasps and findings (and with photos so that you can cross reference) I found on clasps and findings can be found Here....