Lost on the Origin of This Headstamp

Amtech's headstamp, suggested in that thread, is AMTECH on the casehead. Ammotech is AMT, without the C. So you can eliminate those two guesses. Other than that, I'm no help. Haven't run into it.
 
it's strictly circumstantial evidence so far, but in image searches I have seen a couple of pics of that headstamp associated with GECO Whitebox. I tried looking for manufacturers in and around Hungary, but I haven't come up with anything as of yet that might lead to one of them using AMTC as a headstamp.
 
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