2.55 is the classic?

[Chanel lover]

hmm...... and I've been guessing that the name was designation of the size of the bag,
like 225 is 22,5 cm ~ 9 inches width
and 255 is 25,5 sm ~ 10 inches width

but then, I suppose, the 226,227 and 228 wouldn't really make sences with this assumption.