NOTE: Roger Haworth 2025 - These would have been made at Pilabrasgo's ex-Dithridge factory in Jeannette PA. Dithridge was making vase lamps well before the 1901/2 Pilabrasgo merger and production of them continued up until about 1920ish. Pilabrasgo (and probably Dithridge earlier) also offered the lamp bases as stand-alone vases (catalog page is from 1905ish and shows the grape decoration -- another page shows the roses).
NOTE: Similar to vases made by Fostoria. Catalog images also shown pages 118-119 Gary Schneider Fostoria Glass, the Opal Years Book 1.