This style is the middle size in the "600" series, between the 680 (CD 221) and the 660 (CD 218 and 219).
4 1/4" H x 3 3/4" W
• HEMINGRAY • NO EMBOSSING
Rarity Scale (1-10):
Primary Power Distribution
Small Saddle Ridge Variant
This is the  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 , 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.
(F-Skirt) HEMINGRAY-670 / LOWEX / REG. U.S. PAT. OFF. (R-Skirt) MADE IN U.S.A. / [Numbers and dots]
(F-Skirt) HEMINGRAY-670 / ['LOWEX' blotted out] / REG. U.S. PAT. OFF. (R-Skirt) MADE IN U.S.A. / [Numbers and dots]
CD 220 Insulators for Sale
Photos (click to enlarge)
Description / Condition
Current Price Guide Value
CD 220 HEM 
CD 220 Hemingray-670 in honey amber. New  listing for the 2015 price guide. This has the brass bushing embedded in the threads. Appears to be a dump specimen. In pretty good shape with typical roughess and fisheyes. Only one chip to mention: a small flake on the rear base and associated 1" bruise and 1.5" crack up the skirt. Priced accordingly well below book value.
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