Kaiserlich Deutsche Marine Pilot Pilotenabzeichen (Imperial German Navy Pilot Badge) ? In Prinzen Size-Deumer

[militariacoll]

From an elderly gentleman's collection...I believe to be a good one..Any thoughts? I have a few more from this collection to post.

[VtwinVince]

Another one claiming to be a Meybauer example. At least the reverse hardware looks more like being from that manufacturer. There are some problems with this badge as well.

[rbminis]

All three of these also display spurious silver content stamps, mmmm, no.
Ralph.