Very rare WWII German Air Force military watch ( Big Pilot ) RLM Nav. B-Uhr . RLM stands for Reichsluftfahrt ministerium . Nav.B-UHR means Navigation Beobachtubgsuhr. RLM made between 1939-1945 era . Usually for Germay Air Force wore outside the military jacket. 55mm! Lemania made . Sn 192299 dated 1943. Same type of IWC 52SC Accurate and original as it should be.

This is a very rare totally 2000 pieces made Nav.B-UHR RLM by other Swiss pocket movement n this one famous Lemania ! Besides five manufacturers like IWC , A Lange , Stowa ,etc , only four manufactures ( Lemania, Universal , Leonidas and Minerva) used pocket movement to make the Nav B-Uhr. Pls read carefully the below website :
https://pt.scribd.com/document/384503092/Navigational-timepieces-of-the-Luftwaffe

This one Lemania manual wind military can run around 36 hrs and accurate within 1 min . eBay got one A Lange selling at 140000 while one IWC ( limited to 1000 pieces ) selling at 340000! Watch only. Price firmed. Comes w a military strap ( Jurgens , original hand made Germany military Strap 26mm for this masterpiece, Jurgensgermany.com) . Watch in overall 90 percent original condition.