Antique 1905 - early 1920s Shoo Fly Flask Lavender Bottle 7 1/2" The large majority of machine-made bottles with a slight to moderate lavender or amethyst tint - indicating manganese oxide was used as the decolorizer - date between 1905 and the early 1920s The rounder edges differentiate it from the sharper edged coffin bottle. Any anomalies seen are from the production and not cracks etc...