I can't think of a comparable example for American glass. ...
Cathy — We've found one. See the Repeal Glass discussed in topic Bimini style stem, any thoughts on maker? ID = Swingewood for Stevens & Williams (http://www.glassmessages.com/index.php/topic,44134.0.html).
The company was Arthur S. Vernay, Inc. and Vernay & Jussel of New York, NY. Particularly note the text:
The London purchase sheets list goods purchased in England by the firm. Their prices are in code and the vendor from whom they were purchased is not given; however, the pieces are described and their date of manufacture is noted.
Note that direct evidence is very rare. You have to figure it out from circumstantial evidence. I think this is good enough to make Vernay the first example in the USA.
Bernard C. 8)