Manuscript geography book on Asia, Africa, America and Australia with hand drawn maps

Manuscript Geography book/ Atlas, entitled: Geographie von Asien, Afrika, Amerika und Australien. Large 8vo. 152 numbered pages, with 8 full page maps (Asia, North America, South America, Indonesia, African continent, North Africa, South Africa and Turkey). Contemporary cloth binding with gilt lettering on spine.
The maps have been drawn in blue ink, often other colors of ink used for naming cities or outlining details. Seas usually colored blue. An intriguing manuscript atlas / geography book. There is no author mentioned on the title page, but on the first blank is a handwritten name "Martin Greubel".
The name "Greubel" is also in gilt lettering at the bottom of the spine. That makes it likely he was the author of this book. Whether this book was made by Greubel with the idea to get it published or as an amateur or student exercise only, is unclear. We found no further information on the author. Nevertheless, the book is very nicely executed.
The handwriting is very neatly done and well legible, the nice maps all have outline coloring. The last chapter (only two pages) deals with Australia, discussing the mainland, geographical deteails, sailing routes and outlying islands. On the first blank is in a small script also the original price of binding the manuscript.