letter scale

This letter scale was made in Czechoslovakia. Up to 20 grams each gram of the scale has a stripe of measure. Above 20 grams there is a stripe per five grams. The range is 100 grams. The letter scale automatically adjusts itself to zero because the pointer arm is suspended rotatable and gravity does its job. The counterweight has an odd shape. The total height is 116 millimeters.
The design was made by the firm Balduin Heller's Söhne, Teplitz-Schönau in Czechoslovakia. It was protected in April 1935 by a German patent DE1334238. Previously this letter scale was presented, only its top plate differs from the design presented in the patent and from this this letter scale.
Below some more pictures of this letter scale.