Can you post pic of the olsen twins with the bag?
Leathers vary one year from another, it can be smoothy and thick or thinner and soft...etc and also, in the same year, it can be different on one bag from another
Every season has new colors, and sometimes you have some popular colors which are produced every year but with a little difference (lighter, darker or more distressed etc.) e.g. every season has his own black, so you call it 05 black , 01 black etc....
Motorcycle is the name of a line, and all city first twiggy belong to motorcycle line..
I'm not expert either, but learned a lot from this site, it's Bbags Bible