(pic borrowed from a Sandiaexchange auction) When did Hermes stop putting the H in a circle (the logo) on the zipper pull? If you see one on the zipper pull does it mean its vintage? Right now, my Birkin only has "Hermes" written on my zipper pull hardware on both sides. Are all the new ones like this? just trying to learn some history and couldn't find in the reference area. Thanks!