Moritz Grossmann, Der freie Ankergang für Uhren, 1866, Glashütte
Extremely rare atlas with 20 plans.
Grossmann was the founder of the clockmakers' school in Glashütte and worked with Lange & Söhne. Some of the plans of this work are used in the modern catalog of L&S.
This collector's item is for sale for a nice price on a well-known site
(only in German, I'm afraid)