The letters look to be in the wrong orientation for a Mite.
http://www.decadecounter.com/vta/articleview.php?item=128
This Mite article mentions a similar typehead, though,
"The unusual MITE print head is an eight-sided, 64-character cylinder with two directions of motion, derived from a typewriter print mechanism invented by James Dundas White in 1903. In White's design, a cylindrical print head with rows and columns of characters rotates around a vertical axis to select a column, while moving up and down along its axis to select a row."
Wayne