This post compares the CD 134 Patent / Dec. 19 1871 dome embossed T-HE.CO with two of the typical pastel colored CD 134 Patent /Dec 19 1871 with no T-HE.CO dome embossing. It was of interest to observe any differences in mold design.
CD-134 Patent / Dec 19 1871 (Front) T-HE.CO (Top Dome) - (Bubbles & Microbubbles) Yellow Green - 73mm Wide x 98mm Height [id=614871829]
CD-134 Patent / Dec 19 1871 (Front Skirt) - No Mold Number - (Bubbles & Microbubbles) Patel Steel /Powder Blue - 73mm Wide x 98mm Height
CD-134 Patent / Dec.19. 1871 (Front Skirt) - Mold Letter "B" -(Bubbles & Microbubbles) Pastel Yellow Green Cast - 73mm Wide x 98mm Height
It appears that the CD 134 T-HE.CO dome embossed as a slightly different dome design and a wider wire groove than the typical early Hemingray Dec 19 1871 insulators. It's also of interest to note that the wire groove on the CD 134 T-HE.CO dome embossed insulator is nearly as wide as the CD 134 C.E.L.CO insulator. [id=614871404]