CONVEX RIB (AKA) by National Glass Co. 13 [Northwood Works] Indiana-PA (Operated: 1899-1904), c1902 Introduced
NOTE: Gene Serbus - all of mine have the spiral twist. The 1902 catalog cut shows one with vertical ribbing but I have never seen one.

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Shape:Catalogue/Ads
Contributor: Gene Serbus

Shape:Vases, Rose Bowls, Ferners
Contributor: Joann Spears

Shape:Vases, Rose Bowls, Ferners
Contributor: Gene Serbus

Shape:Vases, Rose Bowls, Ferners
Contributor: Gene Serbus

Shape:Vases, Rose Bowls, Ferners
Contributor: Gene Serbus