This Large One Knob was produced by Aenaes Glassworks in Norway.

Floats were produced by Aenaes during a 35 year period from the mid-1840's until 1881.

These large one knob floats are extremely rare.  They are classified as OR #222 in Olaf Raabe's definitive book titled 'European Glass Fishing Floats'.

This float has excellent provenance having been found by Helga Lian in Norway in 2021.