Antique brass folding pocket sundial with integrated compass, engraved “Johan Martin in Augspurg 48.” Features an adjustable gnomon/latitude scale and original compass. Seeking authentication, maker identification, approximate age, and current market value.
Brass folding pocket sundial with integrated compass. Octagonal form. Weight: 38.09 g. Dimensions: 44.5 × 41.8 × 9.5 mm. Engraved “Johan Martin in Augspurg 48.”