(Reference the list below with the one above).
Blank = Relatively Common
S = Scarce (20-100 known)
R = Rare (5-20 known)
RR = Very Rare (1-5 known)
U = Unknown to exist
I recently stumbled upon quite a collection of bottles from all over. Including Lowell and Boston. After looking at the Massachusetts chart, I am wondering what the numbers/letters mean at the top row? I see 1016, 1023, D, 6, 6 1/2. Could someone please elaborate on that? Thanks!