I can only agree with Phil, these are two reproductions. IABs with this obverse design was used by several makers (MK#s, MK in triangle, FZS, etc.) and no originals of these makers has ever been found in hollowback. That should be the first red flag for you on these IABs.
Tom
If it doesn't have a hinge and catch, I'm not interested......well, maybe a little
New Book - The German Close Combat Clasp of World War II
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