A capital alphabet (without ‘P’) drawn by Walter Haettenschweiler with a Rapidograph technical pen and reproduced in Lettera 3 (1968). The name is derived from the OP Art movement. [Swiss Type Design] In the sample, the missing ‘P’ was made from ‘R’.
A very similar film typeface is shown in Lettergraphics’ 1968 specimen as Fat Albert, together with a solid version named Albert. Compared to OP-Letter, Fat Albert has harmonized letter heights, ‘H’ is more even, shadows in ‘C’, ‘F’, ‘R’ are different. Photoscript (1970) and later Typeshop carried another direct phototype adaptation under the original name.