Sherarduct Steel Conduit Advertising Poster Stamps

Two blocks of eight vintage early 20th century advertising vignettes (sixteen 70mm x 56mm stamps) depicting buildings which used Sherarduct electrical conduit in their construction. Overall size: 141mm x 227mm. Mint never hinged.

Stamps of these and similar designs were also produced with the following inscription in the top marginSheraduct Rigid Steel Conduit used exclusively.

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