Hemingray Insulator Profile: CD 121.4  
This is one of a couple of early style insulators that were produced by Hemingray for American Union (A.U.) See also CD 126.3

Dimensions: 4 3/8" H x 2 3/4" W
Primary
Embossings:
• A.U.
• PATENT - DEC. 19, 1871
Years Produced:
c.1880s
Rarity Scale (1-10): Uncommon (5)
Known Embossings (6) Collapse
 
A.U. [010] (F-Crown) PATENT/DEC.19.1871 (F-Skirt) A.U. SB Photo
A.U. [020] (F-Crown) PATENT/DEC.19.1871 (F-Skirt) A.U. (R-Skirt) ['B','C','D', 'E', or '{Backwards E}'] SB Photo
A.U. [080] (F-Crown) PATENT/DEC.19.1871 (F-Skirt) A.U. {Note missing bar in 'A'} SB < WANTED! 
NEW! PATENT - DEC. 19, 1871 [010] (F-Crown) PATENT/DEC.19.1871 (F-Skirt) ['A.U.' blotted out] {MLOB}
Note: Until 2015, this embossing was listed as A.U. [040].
SB Photo
NEW! PATENT - DEC. 19, 1871 [020] (F-Crown) PATENT/DEC.19.1871 (F-Skirt) ['A.U.' blotted out] (R-Skirt) [Blotted out embossing]
Note: Until 2015, this embossing was listed as A.U. [050].
SB < WANTED! 
NEW! PATENT - DEC. 19, 1871 [030] (F-Crown) PATENT/DEC.19.1871 (F-Skirt) ['A.U.' blotted out] (R-Skirt) ['D', 'E', or '{Backwards 'E'}']
Note: Until 2015, this embossing was listed as A.U. [060].
SB Photo

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

Unverified Embossings
Year Removed
A.U. [030] (F-Crown) PATENT / DEC. 19. 1871 (F-Skirt) A.U. / [Letter] (R-Skirt) [Letter] SB 2008
A.U. [070] (F-Crown) PATENT / DEC. 19. 1871 (F-Skirt) ['A.U.' blotted out] / [Letter] SB 2008





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