Everything you wanted to know about Maderia but were afraid to ask :wink: is covered in Tiffin Glass - Figurals, Paperweights, Pressed Ware 1940-1980 by Hemminger, Goshe, and Pina.
Maderia #120 line was introduced in January 1971 in 5 colors - Blue, Citron, Olive, Smoke, and Ice (Crystal). Plum, Cornsilk (yellow) and Rancho Ruby were added in 1972.
More colors were added in later years and production continued until 1980. As Terry said, they were marketed as go-withs to Franciscan China by Interpace Corporation starting in 1974.
I believe your glasses are Cornsilk.