If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.
Well if you find that information let me know because I've never been able to find anything on it either!!! That would probably a be a real project to get that info together.
Which layers were first etc. I bet a lot of this information is lost to history.
AFAIK Bart has this on his "to do" list. He suggested the idea to label hones with the according layer information and sell them kinda "DOCG" style. I'm not sure how Ardennes Coticule responded. However, this will need a tremendous amount of work in order to make it help- and meaningful.