The German Big Pilot navigation watch was originally developed by the Imperial Air Ministry under the administration of Hermann Goering to supply their pilots with watches which were accurate, robust and easy to read during missions. As a general rule, these watches utilized pocket watch movements with a hacking center seconds hand for ease of synchronization. Each watch included in this selection had originally, before being issued, undergone a strict regulation to chronometer specifi cations in the Glashutte region. All of the watches are designated as "B-Uhr", standing for B-Uhren, and engraved with FL 23883 number indicating the watch's assignation. "FL" stands for fl ight qualifi ed; the fi rst two numbers indicate the department the watch was assigned to. 22 was the fl ight control department, 25 was radio surveillance, and 23 was the code number for the navigation department. The watches by Wempe and Stowa utilized pre-made movements by Unitas and Thommen, while watches made by Lange & Sohne, Laco and IWC had movements developed in house. Lange is unique in the fact that they delivered their movements to other companies to be cased and regulated, this information is engraved within the case back. The following Fliegeruhr watches come from a distinguished collection, compiled over many years. Each piece has been meticulously researched and accompanied by appropriate papers, all are offered in exceptional condition for military examples. The IWC's movement number designates that it was the 101st one produced out of a total 1,200.