Hemingray Insulator Profile: CD 150  
While a few of this style were produced by Brookfield, there is only one known specimen produced by Hemingray. It bears the embossing "Barclay", the last name of the inventor who patented the spiral groove (see patent). In effect, it is the big brother to the common CD 147

Dimensions: 4" H x 3 5/8" W
Years Produced:
Rarity Scale (1-10): Unique (10)
Hobby Nickname: Barclay
Known Embossing Collapse
BARCLAY [010] (F-Skirt) BARCLAY (R-Skirt) PATENTED OCT. 8 1907. SDP < WANTED! 

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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Insulator photo courtesy of Bill Meier from www.insulators.info and used with permission.

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