https://typecast.munk.org/2011/04/23/1964-nomda-blue-book-olympia-font-styles/
The following were the available Olympia type sizes as listed in the 1964 NOMDA Blue Book:
- 10 pitch (2.6 m/m) pica
- 11 pitch (2.3 m/m) elite
- 12 pitch (2.1 m/m) elite
- 17 pitch (1.5 m/m, calculated)
Not in the NOMDA Blue Book, but found in the wild on a 1971 Olympia SG-3: - 6 pitch (4.2 m/m) with typeface: Basic Writing No. 67