OPEN O'S (AKA) by National Glass Co. 13 [Northwood Works] Indiana-PA (Operated: 1899-1904), c1903 Introduced

 • AKA: Heart Handled Open O's
NOTE: This pattern was continued by Dugan Glass Co. 1904.

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Shape:Novelty Worked
Contributor: Vanessa Fronce, Nancy Dawson

Shape:Novelty Worked
Contributor: Contributor: Bill Banks (1-5), Chip Honse 2/28/2026

Shape:Novelty Worked
Contributor: Brian Widner, May Ridolphi Eason, Roger Haworth, Jennie Klecker

Shape:Catalogue/Ads
Contributor: Paul Kirk Jr.

Shape:Catalogue/Ads
Contributor: Paul Kirk Jr.