Serial number 119813,
Manufactured December 1906
A lid, as found, is included
A portable typewriter that uses one central wheel with 84 characters, instead of mini type bars. The Blickensderfer central wheel design meant you could easily change the typefaces by swapping out the wheel (available wheels included other languages, other fonts and even musical notes).
The Blickensderfer keyboard is based on a “scientific” keyboard, which put the most common letters, DHIATENSOR, closest to the typist. In English, the lower row ended up being used 70% of the time in the second row 24% of the time. The QWERTY keyboard, that we know today, was designed because the type bars were being jammed by fast typists, so the more common letters needed to be separated to stop the constant jamming.