The beautiful Keystone typewriter uses a rotating type selector, shaped like a partial wagon wheel. The characters are molded onto the outside surface of this wheel, which is rotated into position with the depression of a key. Then a spring-driven hammer strikes from behind to push the paper and ribbon against the type wheel. As a result the paper is preloaded into a cylindrical holder behind the platen and unrolls up and out when typing.
The swinging type-sector could be easily changed for different font styles.
There are two shift keys on the left, giving three functions to each key, allowing for three not four rows of keys.
The Keystone typewriter was a comparatively low priced keyboard machine, selling for just $35.00.