I believe this is a winner......thank you, gents. Kutter.....your google-fu must be better than mine!!


Originally Posted by Kutter
SKB is correct I believe.
I have some 500 x 3" brass that is from them and is headstamp marked HH


Added:
A quick search and this appeared..
https://www.huelsen-horneber.de/index_en.html


Quite a selection of brass they mfg'r !


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