Dr. Bolt says of this telescope: In my opinion, the most spectacular surviving decorative telescope from the 17th century is this ivory example now at Chicago’s Adler Planetarium. The 5 draw tubes extend to about 80 cm, making it very heavy to use. The ornate scalloped main tube – consisting of 4 tubes that screw together – strongly suggest it was made in Germany c.1660, perhaps in Nuremburg, a center of ivory trade and the production of ivory sundials.