That's interesting Mitch. Five months ago I bought that same watch with the fancy Swiss ETA movement from Steinhart. The one I purchased is a 44mm watch only because they didn't have the 47mm in stock and only the originals were 55mm across or I would have gotten one in that size.Many of the watches I have now are automatic watches. This model is referred to as a Nav B-Uhr B-Type and it would have been worn by the observer on the bomber. The Nav B-Uhr A-Type only has the outer numbers. Interesting as well is that the watches belonged to the German Military and not the pilots or observers. The watches were checked out prior to flight and had to be checked back in upon their return. I think it is a great watch and wear it often. This is part five of a five part history of the pilot watch. Part five deals specifically with this watch. The first four parts are linked at the bottom of part five. The first four parts tells the history of how pilot watches came to be:
https://monochrome-watches.com...tch-part-five-b-uhr/
