oh i forgot to ask, what is sellier? i know that box is a kind of leather that hermes uses together with others like togo, clemence, chevre and swift. is it a particular shape or size of the kelly?
Yes, sellier is a particular Kelly shape. Kellys can be made with the seams on the outside (sellier) or the inside (retourne). Sellier Kellys look sharper, more structured, and more formal, while retourne Kellys look slouchier and more casual, especially in softer leathers like clemence. Both are gorgeous, but in my mind they really are two different bags.
In other words, you may want both!
