An equatorial sundial in original leather case by Johann Georg...

An equatorial sundial in original leather case by Johann Georg Vogler (c. 1720-1765), Augsburg, Germany. Silver and gilt brass, octagonal engraved plate. The geographic latitude of the observation point is set to the quarter-circle on the side, on the backside of the ground-plate are engraved the geographical declinations from several European towns. Original paper instruction manual included -5,5 x 5 cm, some signs of wear- A rare and interesting sundial.