Pyrex 171

Basic
Region: North America
[[ Insulator ]]
Type: Transmission
Material: Glass
Style code: CD-320
Maximum Power: 72kV dry, 45kV wet
Manufacturer: Corning
Production Start: ~1900s
Production End: Late 1920s
Rarity: Rare
Specific Object
Date Made: 1900-1927
Specific Object Condition: Excellent

This insulator was made by Corning under the Pyrex brand. It is made out of carnival glass, and is relatively rare. It is deceivingly small, at just under 4 inches tall.

It reads across:

CORNING PYREX TM. REG. U.S. PAT. OFF. MADE IN U.S.A 171