Dating antique bottles
By 1915 most manufacturers had switched to this style top.Crown tops lasted through the 1960s when screw tops began to replace them.
They were more cost effective to produce and the bright colors enhanced point of sale marketing efforts.
Despite its name, it is not a particularly long matured whisky.
It is a mid market blend (below Hibiki in Suntory's blended whisky pecking order but above Kakubin and the bargain basement Torys.) There are various ways to tell younger bottles from older version.
Dark green beer bottles were used by many brewers in the 1800s.
Colors like cobalt blue was used to color bottles right from 1870s to the 1930s.