Here is an early caliper I acquired. Reminds me if Enden Glashart but without any oval window. Marked "Engli" and "Miter" ?? Hard to read. Also had a 5 point crown logo or whatever they called those markings German factories used.
Owner, the crown might have been the company that made them. That is the type of mark the Germans often used. Yesterday on my IG I posted a German or French mic with a mark of 2 lion heads, back to back with their tongues hanging out inside a triangle.