I can tell you what the first digit means Sergio. According to mthe Kosta Boda Book of Glass, 1986
1**** Not allocated
2**** Stemware (ie Glasses)
3**** Not allocated
4**** Vases
5**** Bowls
6**** Candleholders
7**** Plates & Ashtrays (an interesting combination ! )
8**** Decanters
9**** Miscellaneous.
Ross