Hemingray Insulator Profile: CD 317.5  
This style is the second rarest of the four insulator styles Hemingray produced for the Chambers lightning rod system. 

Dimensions: 5" H x 4 1/2" W
Years Produced:
Rarity Scale (1-10): Rare (7)
Usage: Lightning Rod System
Hobby Nickname: Bell Chambers
Known Embossing Collapse
CHAMBERS [010] (F-Center) CHAMBERS/PAT AUG 14 1877 (R-Center) PATENT/DEC. 19. 1871 SB Photo

The following embossings were removed from the price guide because they could not be verified to exist:

Unverified Embossings
Year Removed

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