For sale: an extremely rare watch for aviation pilots. Dated 1938–1939. Water-resistant nickel-plated brass case with a screw-down case back and fixed lugs. Bidirectional rotating metal bezel, nickel-plated and knurled, with a triangular metal index, located outside the crystal. Black dial marked “Hanhart.” The hour markers and minute hands are luminescent. The exterior of the case back is marked “Wassergeschützt” (water-resistant), “Stoßfest” (shock-resistant), and the number 100054. The interior of the case back is unmarked. Unmarked movement, Hanhart Caliber 40 chronograph. The watch has never been polished and is entirely original and in perfect working order. The service history of the watch is unknown, unless otherwise noted in the description. Watches are inspected to verify proper functioning. Watches are used and may show minor signs of wear, unless otherwise noted in the listing.