Engraved Roman glass flask

Rhineland or Gaul
Second half of III century A. D.

Clear colorless glass. Spherical body with slightly flattened base and slightly concave bottom; tubular neck with tooled indent around base. Rim intentionally sliced off  and reheated. Engraved ornamental bands of multiple parallel lines: on the neck, and four bands on the body. Iridescence of different thickness layers in places. Intact.
Height  4.3 ” (11cm), diameter 2.8” (7.2 cm)
For published archaeological examples see:
-F. Fremersdorf, E. Polonyi- Fremersdorf, 1984. Die farblosen Gläser der frühyeit in Koln. 2. Und 3. Jahrhundert. Der archäologischen gesellschaft und dem Römisch Germanischen Museum Köln, p. 38 catalog # 92, 93, 95, 98.
-Kunina N. Ancient Glass in the Hermitage Collection. ARS Publishers, LTD, St. Petersburg, 1997, catalog # 225-226.