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The U-Boot watch dial.

 

The A.Lange Sohne dial on this watch is still after many decades I have owned this watch, the most stunning dial I own. As you are already aware, this dial had a very austere look and purpose. It was a U-boot watch dial used for dead reconning navigation. It's extraordinary dial was designed to charge during white light and then remained luminous during red light mode of battle. Red light mode was used to protect the night vision of the crew when encountering an adversary. The boat navigator needed to see the time at all time to locate the boat. This was especially critical when navigating the submarine under water when attacked near under water cliffs. The sonar could not be used when silent running as this would give away the sub's position so this watch and a map and compass was all that saved the crew. 1160 U-boots were built for WW2, 780 were sunk. A German submarine was a bad place to be. About exactly the same number of luminous ALS B-uhren were produced and lost to the sea. A watch like this one with all markings intact is extremely rare. It still has the Keigsmaine issue markings.














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