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I just searched Gustav Heyde, Dresden and got a lot of credible hits - as opposed to eBay hanger ons.

One was:
Gustav Heyde Dresden Telescope ca 1896 - 1900
Reading the history of Steinmeyer Group Company, we learn:
In 1872, when Gustav Heyde founded "Gustav Heyde - Mathematisch-mechanisches Institut Optische PrÃcizions-WerkstÃtten, his first products were optical components. Soon these were followed by circular dividing engines, the prism grindery, and industrially manufactured photographical lenses. By the start of the 20th century, the continuously growing company already sold its products worldwide including manufactured astronomical instruments, optical systems and geodesic measuring instruments. In 1912, the Company counted 200 employees.”
After the war, in 1948 the Gustav Heyde company changed name -VEB Optik Feinmess Dresden . Later, in 1970 the Company became a part of the Veb Carl Zeiss Jena. Finally, in 1992 Feinmess Dresden has became a part of Steinmeyer Group
The Gustav Heyde Company published price list catalogues. We have found some - price lists for; Astronomical Instruments - in March 1905, Optics - January 1909, Part machines and auxiliary instruments - February 1911 and Astronomical Instruments -December 1912.

Regards, Noell