The basic form of KalKometer is derived from the Tasco Arithmometer. They converted from the center pull reset to the loop style and removed the shield. The instruction sheet for "The Handy New Kalkometer" was a minor re-write of the instructions for the "The Handy Arithmometer". The slogan on the face of the Kalkometer - "Aids in Multiplication" is taken directly from the instruction sheet for the Arithmometer.
The early models of the KalKometer used screws to hold the faceplate to the plastic backing. The plastic backing came in a variety of colors - black, brown, and brown with black swirls were common.
All the plastic backings that I've seen have NOT been made from Bakelite but that doesn't mean some early models didn't.
The minor rewrite of the instruction sheet for "The New Handy Kalkometer" was used by Thorsen, inc. for the American import of the West German Wizard Calculating Machine. That instruction sheet in turn became the basis for the Simplified instructions for the Magic Brain Calculator.