CONVEX RIB (AKA)
• AKA:
• MAKER: National Glass Co. 13 [Northwood Works] Indiana-PA (Operated: 1899-1904), Introduced: 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.
• MOTIFS: Swirls/Spirals, Opalescent, Stripes & Swirls ,