All-lowercase Optex (Letraset, 1970), reversed and with black and white lines, for the cover of Cooking with Microwave Magic.
The spiral-bound cookbook was authored by Joan Toole, “a leading authority and pioneer in the field of microwave cooking” and also “president of her own firm, Microwave Magic Co.” [Morton Grove Public Library]. It was published around 1975 – in that year, the sales volume of microwave ovens for the U.S. industry had grown to one million, compared to 40,000 units in 1970. A third edition came out in 1977 (see below), and a sixth edition in 1983.
Revised enlarged third edition, 1977