The von Siegrothska collection consists of a number of scientific instruments dating from the mid 1600s, which had been used for teaching at the War Academy.  Major General and Lieutenant General Gustaf Adolf von Siegroth quite possibly could have acquired some of the instruments, including the theodolite when his regiment was in garrison in Landau. von Siegroth came to Landau in 1778 to institute a military academy at the Royal. He donated his collection Södermanland regiment in Sweden in order that it could be used for regimental military training. The deed of donation from 1778 includes his instruments aw well as donated books, drawings and plans.

The collection was included in the Södermanland regiment officers counter selling on selected parts, including medals, the instruments were kept for their traditional purpose. The regiment was disbanded in 2005 and the collection was taken over by the regimental officers social club, which is now selling the collection at auction.

The collection includes a theodolite dated 1566. A theodolite is an instrument used for measuring horizontal and vertical angles. It features a circular base along with a compass and a foldable protractor with alidade, this determines the position of an object relative to the viewer, is engraved with scales, city name and astronomical characters. The work is completed in Munich by Ulrich Schniep and completed in gilded and silvered brass. Theodolites were mainly used in astronomy which was a very important subject at the time.

Objects such as these are rarely seen on the auction market and a collection like the von Siegrothska is highly unusual. This theodolite is one of the earliest known examples and is a distinctive work by Ulrich Schniep.