it looks like a variation of the tron series, from f/w 07.08...
here's another pic from balenciaga.com
style.com called it the "envelope bag," but balenciaga has another bag with the same name from that season (it was tri-tone), so i'm not sure of the exact name of your style...
i believe it retailed for $1198...
Chauss, your vintage first looks like it is in perfect shape! From what year is it?
a chauss "classic in-my-closet find" vintage white first with classic pewter hardware
Is that Dame Edna behind you? B)