It lays in its leather case with geometric designs in glazed leather and bears at back exclusively the latitudes of German cities, Amsterdam, Prague and Vienna.
Maker : Johann Melchior Hager 1642/1713, active in Frankfurt and related to Wolfgang Hager active in Wolffenbüttel at the same period whose an example is described and illustrated p 174/175 in “Sundials – Dominique & Eric Delalande – Paris 2013”.
Reference : “Uhren und Wissenschaftliche Instumente der Familie Hager – Günther Oestmann -Stadtisches Museum Braunschweig”.
Frankfurt made circa 1690.