I bought this a couple months back for cheap in a much worse, rusted state. Definitely not my normal area of collecting and knowledge so it’s stumped me for a bit now.
After cleaning it and a single marking coming out, I can definitely say its a German 2cm / 20x138b case extractor, but upon comparing it to ones I could find on Google it’s quite different, maybe just a variant? The single marking is a simplified German eagle with “WaA 153”.
It does seem it was put back together wrong, with the 3 threaded “fingers” being at the bottom and not the top of the extractor. It unfortunately will not come apart despite my best (gentle) efforts. It seems to be only 3 parts, the “case” head, sleeve with 3 fingers and a centre rod which threads into the head with the loop at the top. The head also has 2 wrench flats on either side.
I’ve included one of the few photos of a good condition, complete case extractor from the net.
Thanks in advance!