Hello all. I've lurked on this forum as a guest for awhile, but had a question that doesn't seem to have been answered in the historical posts. As a brief introduction, I am a WW1 historian and collector of Imperial German items (mainly Kaiserliche Marine) and don't like to show off my stuff too much, but could share a few items if interested (Tellermützen, EKIs, etc.)
(note: I'm not selling or buying any of these, just looking for some info).
There seem to be a variant of Imperial U-Boat badges that doesn't match the Walter Schott, Meybauers, Third Reich era hollow stamped ones, or really any of the more common ones. They are marked with a Marian Cross (sometimes more detailed than the others) and appear to definitely be 1930's era makes given the hardware and the fact that about half the ones I've seen are zinc. I've attached a selection of some I've seen online or have handled personally (I believe a user on here posted a zinc one he had a long time ago with most of the gilt worn away).
Concerning the image, going clockwise from the top left:
1) a strange badge whose obverse matches the Marian Cross make's style exactly, but seems to have been modified at some point to a screwback. You can see evidence of a hinge for a pin that wasn't totally machined off. I couldn't say if the maker's mark was also ground off to make room for the soldered upper pin to prevent movement.
2) a zinc example on John Telesmanich's site for sale - this zinc version seems to be the most prevalent
3) another piece whose obverse is more deeply struck than the others, but otherwise has the same obverse pattern. Pinback is typical 1930's style.
4) a piece currently on ebay with the same pin hardware as the previous, but with the softer striking as the others.