We were lucky enough to have an "older" hermes Craftsman at one of my stores that I visit late last year, direct from Paris. He was vacationing, but had a commitment at the store for a few days, and I happened to be there when he was. I have always been...intrigued....by the "Master Craftsman Stamp" thing (two of my bags have the "celtic cross" marking) so (assuming he was a Master Craftsman) I asked him all about it. He spoke French, so I asked through my SA (who is French) - she looked puzzled, but asked him anyway...he looked puzzled, and then said he had worked with the company for 40+ years, and had never heard of such a thing, and if there was such a thing, he would be considered one himself! *much laughter in a French accent between craftsman and SA...I secretly think at my expense!* - LOL! I showed him the mark on my Birkin (the Celtic Cross) and he explained (via SA) that all the celtic cross denotes is a particular "type" of leather, or leather "treatment" (I'm still not completely sure which he meant). He basically said there were Senoir Craftsmen who taught the new craftspeople, and everyone has their own number, but no-one has their own special "mark", as such. He also said sometimes, if an older, retiring craftsperson has an underling which they particularly like, they will "pass down" their number to them (and their tools!), but usually, everyone is given their own number, and keep it with them until they leave - it's quite superstitious (THAT bit added by my SA...) He said as far as special marks are concerned, the only craftspeople who use these at Hermes are the porcelain artists. Interesting?