A German Chrome-Plated Map Measurer (Opisometer), Mid-20th Century

A German mechanical map measurer or opisometer, mid-20th century. The instrument features a circular chrome-plated body with a serrated tracing wheel, swivel suspension ring, and a dual-scale paper dial protected by a clear crystal. The dial is marked GERMANY and includes scales for Inches to Miles and Centimetres to Kilometres. It is accompanied by a brown pebbled leather pouch with a press-stud closure stamped MADE IN GERMANY in gilt.