Many of the bottles that don't specify how old they are (50+ yr, 20+ yr) will indicate a number. No. 10, No. 12... Is this a standard indicator of quality and if so, what does it mean? I'm looking specifically at Compagnia del Montale's No. 10 and No. 12- I see both at the same price and don't know which one might be older/better.
Any other good recs in the $50-$75 dollar range?