It could be...I do not know anything about glassware. My one Grandmother traveled in the 20's and brought back a lot of china, including hand painted Quimper ware from France, Wedgewood from England and English tea cups etc...she went on cruises in the Mediterranean in the 1920's, her husband was a big deal agent for a NYC real estate firm. Since a curator at Peebles Island New York State Restoration looked at it and thought it might be 1920's, but there are no clear markings on the base...I can feel a glob of glass with a couple of arrow like small indentations on either side of the glob...the curator could not decifer any markings. Curator did not say if it was American..but it could be. I work full time so it is hard for me to actually get out and hunt down one like this, which I think will be hard to do..