Scientific Scandinavian ruler heavy 1920

Antique heavy bronze and nickel measuring ruler made by Michelsen of Norway for Danish company Moeller & Lanschutz. This rare and unique vintage ruler bronze and nickel measuring device with cm and Inches. It is stamped underneath by Michelsen of Norway circa 1930 is the ultimate desktop accessory and is very heavy at 360 grams, ideal as a paperweight. The bronze spine is cast in one section and bronze is rivetts through the solid Nickel base. Unusual to this is that the ruler has a slight machined curved base for greater accuracy to the edge whilst retaining the exact dimensions. 1920's