Hemingray Insulator Profile: CD 169  
This is a prototype style produced by Hemingray in c.1910 for an experiment with AT&T to design a new standard insulator. The CD 157 No.38 and the CD 152 No.40 were also candidates. The CD 152 won out, and only about five or six of this style are known to have survived the various "stress tests" to which these insulators were subjected. 

Dimensions: 3 5/8" H x 3 1/4" W
Primary
Embossing:
HEMINGRAY
Years Produced:
c.1910
Style Number:Type I
Rarity Scale (1-10): Very Rare (8)
Known Embossing Collapse
 
HEMINGRAY [010] (F-Skirt) HEMINGRAY (R-Skirt) TYPE.I
Note: Embossing was updated in the 2015 edition of the price guide to show a Roman numeral "I" rather than a number 1 in "TYPE.I"
SDP 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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