This fine armillary sphere is unusual for two reasons: first, the usual form of construction is of separate rings riveted together, but here, as is occasionally seen, the sphere is constructed from two brass hemispheres fret-cut and joined together to produce the final effect of rings for polar, tropic and equatorial circles and colures. This construction is more commonly found on spheres which incorporate pictorial constellation figures, but is sometimes seen on more straightforward armillary spheres (see also Kugel A7 and A8, Dekker AST0623). Second, the ecliptic band incorporates an unusual movable gnomon to allow the sphere to be used as a sundial. This style of combination is rarely seen and is attributed to the clockmaker Hans Buschmann the elder of Augsburg; Kugel illustrates a sphere with a similar design (A7), attributed to Buschmann and dated to circa 1650, as well as reproducing a Buschmann drawing of a sphere with such a gnomon. Although the Kugel sphere is also of fret-cut construction, the engraving of the numerals and overall design is different enough to suggest that the present example is from a different workshop.