It was in 2000; for the spring, I believe. I was working in a dept store as well & bought my first Coach in 1999 & all I had to choose from was the original leather with NO lining! I remember not really digging the "C"s at first! Obviously they grew on me quickly!
I don't think i would call them a "classic", though. I think the "classics" are still your Legacy Zip, Janice's Legacy, The Willis, The Station; the original with no lining. Maybe in 10 years or so?