On the older care tags, the longer ones, you can sometimes find numbers or letters. There has been a rumour that these letters or numbers identify the roulleteuse (lady who handstitches the hem) and that only the most senior roulleteuses are allowed their own 'labelled' tags. I haven't seen this rumour confirmed, nor denied neither. I haven't seen any letters/numbers on the new short care tags, though...
No one has to agree with me, IMHO the whole roulotteuse story is an urban myth that has a life of its own. Someone heard it from an SA and everyone now believes it.
My reason for disbelieving this story is that the letters A, B , P & M keeping popping up on everybody's scarves as if 4 ladies sewed half of the scarves on this planet. And there is something like a million new scarves a year...
Well, that's my story and I sticking to it LOL
PS there are letters underneath the new shorter tags - but you have to look under the tag to see them
I'm trying to find the post, but in October a few members went to a scarf event in SCP and this question was asked of the gentlemen doing the Hermes scarf demonstration. I believe they did acknowledge that it did identify the hem roller.