Spent the weekend looking over and doing the CAD modeling for replicating the German Bamberg Compass. There were many different versions produced during WWI, for both Aircraft and Ships. We have 6 originals aircraft versions in the shop now for restoration, and to use for reference in building new compasses. Here are the originals, and you will see there are 3 different models.
Here are a couple of CAD screen shots. Note there are two different crystals shown, one with a pointer for setting your course, and one without. I think we will offer that as an option.