All companies that were commissioned with the completion and final assembly of Lange&Söhne B-watches for the Reichsluftwaffe

These final assembly companies were also listed by name on the case back. Only a few genuine and authentic Lange & Söhne B-watches were also final assembled and finished by Lange & Söhne in Glashütte, and if so, the Lange & Söhne name was mentioned twice on the case back.

Well-known companies that received orders for final assembly:

.Lange&Söhne Glashütte itself

• Deiter in Essen
• Felsing / Berlin
• Fischer & Trabant Pforzheim
• Institute for Watch Technology Hamburg Harburg
• Näher & Schätzle Pforzheim
• Schätzle & Tschudin Pforzheim
• Schiron Stuttgart
• Schlosser-lago Vienna
• Steinbiss Schwäbisch Gmünd
• Walter Storz Pforzheim
• FN Tietz Kiel
• Karlstein Watchmaking School - Movement numbers 210621 to 210630
• Chronometerwerke Wempe Hamburg

Source: Konrad Knirim "Military Timepieces"