DUNCAN, GEORGE & SONS No. 306 and 307 (OMN) by Duncan, George & Sons/Pittsburgh-PA (Company Operated: 1874-1891), Unknown Date of Introduction
NOTE: Brad Gougeon - Early Duncan Glassware shows the two side by side and the only difference is height. Unfortunately the illustration does not give height or volume for either.

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Contributor: Ed Perva

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Contributor: Andy Vaughn

Shape:Catalogue/Ads
Contributor: Sid Lethbridge

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Contributor: Robert Nathan Korn

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Contributor: John Ragsdale

Shape:Tumblers
Contributor: John Ragsdale