Ribbon material: nylon
Ribbon color: black and red
Spool diameter: 2 inches (50mm)
Ribbon width: 1/2 inches (13mm)
Some interesting information: This Bulgarian typewriter was introduced in the 1940's by Keller & Knappich GmbH of Augsburg. This company, started in 1898 by Johann Josef Keller and Jakob Knappich as an acetylene factory, and still operates as KUKA, a leading producer of industrial robots. It appears that KUKA was still making Princess typewriters at least into the early part of the 1960s.