1940s Leonidas Rare "RLM-Nav" German Air-Force 38mm Water-resistant Chronograph Brown Dial

1940's Manufactured Leonidas Rare "RLM-Nav" German Luftwaffe 38mm Water Proof Chronograph. The black gilt dial has turned a darker brown color with age, and the case shape is massive with no signs of case thinning. The "RLM-Nav" was also produced by Minerva, Universal, and Lemania at the time, and Leonidas' unique step design and screw back case is unique in that the middle case screws into the back side, rather than the usual method of screwing the back into the middle case. It is equipped with the famous Valjoux Cal.22 with shock absorber.