Hemingray Insulator Profile: CD 220  
This style is the middle size in the "600" series, between the 680 (CD 221) and the 660 (CD 218 and 219). 

Dimensions: 4 1/4" H x 3 3/4" W
Primary
Embossings:
• HEMINGRAY
• NO EMBOSSING
Years Produced:
c.1937-1940s
Style Numbers:67, 670
Rarity Scale (1-10): Common (3)
Usage: Primary Power Distribution
Voltage Rating: 10,000 Volts
Mold Variations Collapse
Small Saddle Ridge Variant
This is the [040] mold variation, which has a smaller wire ridge, a more pinched saddle groove running from front to back (perpendicular to the embossing) and is also 1/8" taller. The embossing is also the newer, small stamped style. This mold appears to only have been made in 1947.

Personally, I feel this mold variation is significant enough to warrant its own CD number (such as 220.1).
Locke Hi-Top Style Variant
This is the CD 220 No Embossing [010], Locke Hi-Top Style variant. It is believed to have been manufactured by Hemingray, and was most likely a dump specimen. There are two distinguishing features of the Locke Hi-Top style: the top wire ridge has an extra "step" and the ears are flatter. Photo courtesy of Bill Meier.
Known Embossings (12) Collapse
 
HEMINGRAY [010] (F-Skirt) HEMINGRAY - 67/[Numbers and dots] (R-Skirt) MADE IN U.S.A./[Number] SB Photo
HEMINGRAY [020] (F-Skirt) HEMINGRAY - 670 (R-Skirt) MADE IN U.S.A./[Numbers and dots] CB
HEMINGRAY [030] (F-Skirt) HEMINGRAY - 670 (R-Skirt) MADE IN U.S.A./[Numbers and dots] SB Photo
HEMINGRAY [040] (F-Skirt) HEMINGRAY - 670 (R-Skirt) MADE IN U.S.A./[Numbers] {Smaller ridge and a saddle groove running from front to rear} CB Photo
HEMINGRAY [050] (F-Skirt) HEMINGRAY - 670/LOWEX (R-Skirt) MADE IN U.S.A./[Numbers and dots] SB Photo
HEMINGRAY [070] (F-Skirt) HEMINGRAY - 670/LOWEX/REG. U.S. PAT. OFF. (R-Skirt) MADE IN U.S.A./[Numbers and dots] SB Photo
HEMINGRAY [080] (F-Skirt) HEMINGRAY - 670/[Numbers and dots] (R-Skirt) MADE IN U.S.A./[Number] SB
NEW! HEMINGRAY [082] (F-Skirt) HEMINGRAY-670/[Numbers and dots] (R-Skirt) MADE IN U.S.A./[Number] {A brass bushing molded into the pinhole with a square at the top} SB Photo
HEMINGRAY [090] (F-Skirt) HEMINGRAY - 670/['LOWEX/REG. U.S. PAT. OFF.' blotted out] (R-Skirt) MADE IN U.S.A./[Numbers and dots] CB Photo
HEMINGRAY [095] (F-Skirt) HEMINGRAY - 670/['LOWEX/REG. U.S. PAT. OFF.' blotted out] (R-Skirt) MADE IN U.S.A./[Numbers and dots] SB
HEMINGRAY [100] (F-Skirt) HEMINGRAY - 670/['LOWEX' blotted out] (R-Skirt) MADE IN U.S.A./[Numbers and dots] CB
NO EMBOSSING [010] [No embossing] {Locke Hi-Top style} SB < WANTED! 

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

Unverified Embossings
Year Removed
HEMINGRAY [060] (F-Skirt) HEMINGRAY-670 / LOWEX / REG. U.S. PAT. OFF. (R-Skirt) MADE IN U.S.A. / [Numbers and dots] CB 2003
HEMINGRAY [110] (F-Skirt) HEMINGRAY-670 / ['LOWEX' blotted out] / REG. U.S. PAT. OFF. (R-Skirt) MADE IN U.S.A. / [Numbers and dots] CB 2003





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