CONVEX RIB (AKA) by National Glass Company (Northwood Works) (Indiana-PA, Co. 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: Vases, Rose Bowls, Ferners
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: Catalogue/Ads
Contributor: Gene Serbus