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Vintage CD 147 spiral-groove glass insulator, featuring the #15 embossed on the dome and PATENTED OCT 8 1907 embossing.
This is the classic Barclay-patent spiral-groove style, manufactured by Hemingray for telegraph service. The numbered dome variants are documented variations of the CD 147.
Vintage/antique condition with normal age-related scratches, scuffs, bubbles, and manufacturing imperfections. No substantial damage. Base has little to no chips
