Monotype matrix case.
Lanston Monotype Machine Company,
Shown here is a relatively early version of a Monotype matrix case, containing 225 matrices for a font of type presented in 15 rows and 15 columns. The arrangement of characters in the matrix case would vary by typeface. This matrix case contains a 10-point font of Typewriter. Monotype was primarily used for book printing and fine press work in contrast to the periodicals and inexpensive, mass-market books printed from Linotype.
From the collection of Rare Book School