BLOCK (AKA) jef by Jefferson Glass Company/Steubenville-Ohio/Follansbee-WV (Operated: 1900-1930), c1902 Introduced
Bowls including rare cobalt opalescent. Also found with frit decoration.
Reference: Heacock/Elmore. Opalescent Glass from A to Z page 32

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Shape:Novelty Worked
Contributor: Gene Serbus (1,3), Sandy Wilkin (2,4), Amy Lynn Vincent (5,6) 10/1/25

Shape:Novelty Worked
Contributor: Gene Serbus (1-4), Cathy M Cavalcante, Laura Thompson, Todd McCorkle, Aaron Judd 10/1/25

Shape:Novelty Worked
Contributor: Aaron Judd, Cathy M Cavalcante, Laura Thompson, Gene Serbus, Kathy Marie 10/1/25

Shape:Catalogue/Ads
Contributor: Gene Serbus

Shape:Novelty Worked
Contributor: Gene Serbus, Bill Banks, Jim Masterson

Shape:Vases, Rose Bowls, Ferners
Contributor: Jason Burgess, Jim Masterson, Bruce Preston, Gene Serbus, Pam Wojcik, Nancy Dawson

Shape:Novelty Worked
Contributor: Gene Serbus

Shape:Novelty Worked
Contributor: Jim Thielen (1-3), Gene Serbus

Shape:Catalogue/Ads
Contributor: Jim Thielen