A Narwhal Tusk Walking Cane,, 19th century

the brass ferrule marked CORONA PAT 20625/6 46 US, the tusk bearing spiral grain, with leather handle attached to the root for decorative purposes by ferrule, marked with crest reading US,
the main shaft 29in (74cm) long; 36in (91.5cm) overall

In medieval Europe narwhal tusks were erroneously identified as the horn of a unicorn. It was not until 1555 when the Swedish cartographer Olaus Magnus proposed that such tusks belonged to a marine species, depicting them as large sea monsters which could capsize ships.