Those are Lemo connectors. The Austrian public broadcasting network (ORF) used to require them for all outboard equipment. There were "C 451 L" microphones in the mid-1970s, for example, and their recording trucks had Studer C 37 decks with Lemo connectors instead of XLRs.
However, the fact that there are only five pins, and the absence of an original pattern selector box, imply a microphone that was hard-wired for fixed rather than remotely variable patterns. It may be that the pattern controls on the Drefahl power supply aren't in the circuit. If you're bidding on this microphone, you might want to check with the seller about that. [Edited later to add the sound of me smacking my forehead; I certainly know how Lemo connectors are arranged, but didn't think about what I was seeing in the photo when I wrote this. --ds]