I hate to say this, but I think I recall my mother's old manual typewriter having about about dozen extra keys, with "wing-dings" like 3/4, 1/2, (c), cents, and pounds (L). Any chance there were any typewriters out there with a "th" wing-ding? It might explain why he winged the 7th, but left 1st normal.
I don't recall any manual typewriters having extra keys, but there was a model of the IBM selectric produced in the 1970's that used interchangeable "font balls" that included some extra characters. The "font balls" came in assorted flavors: pica, elite, lettergothic and courier. Times New Roman and other proportional fonts were not available.