JEFFERSON GLASS CO. No. .78 (OMN) by Jefferson Glass Company (Steubenville-OH/Follansbee-WV, Co. Operated: 1900-1930), c1902 Introduced
NOTE: Gene Serbus 2024: Jefferson rose bowls have 12-flute crimping as opposed to the 1939 Fenton which has 8. Also note the slight differences in dimensions between the two makers. They are both 5D but have slightly differing base diameters and heights.
image 1 of 2

Shape:
Contributor:

Shape: Vases, Rose Bowls, Ferners
Contributor: Gene Serbus Fenton's French Opalescent Spiral Optic and Blue Ridge were produced for only one year, 1939 [Whitmyer, Fenton Art Glass Patterns 1939-1980]. Both Jefferson and Fenton rose bowls are 5"

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

Shape: Vases, Rose Bowls, Ferners
Contributor: Gene Serbus 4.25" hgt./base 3" diameter

Shape: Vases, Rose Bowls, Ferners
Contributor: Don Jackson

Shape: Vases, Rose Bowls, Ferners
Contributor: Jimmy Thompson

Shape: Catalogue/Ads
Contributor: Jim Thielen - China Glass Pottery review 1901