I believe your pieces were done by an artist named Dorothy Thorpe she was an artist who had a decorating studio in the Los Angeles area, from the 1930's and on into the 1950's she purchased glass from various companies, decorated it, and sold it. She also designed ceramics. I have a set of glasses done in light green with that clambroth color like yours but mine have green on bottom & clambroth on top. Mine also has her small stick on label still attached as this is how some pieces were marked.