Octagonal brass Butterfield type sundial. Triple silvered hour circle. Compass mounted on cardan. Back engraved with the latitudes of about thirty cities. Three adjustable feet.
Signed "Johan Martin in Augspurg 48".
(Bird of the missing gnomon).
Diameter: 6,5 cm
Johan Martin, born in 1642, received Master in 1669 in Augsburg where he died in 1721, was specialized in the manufacture of portable sundials, always of high quality.
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