Identifying 5pin locking mini connector / manufacturer logo

I've been trying to identify this connector for a while without success. The manufacturer logo is clearly visible on both ends, but I've no idea who this manufacturer is or what the connector may be. (More detail later, run out of time!)

Hoping someone will identify this logo on sight; any help gratefully received!

probably a 5pin mini DIN, try RS in UK,NZ or Aust

Kinda looks like it might be Lumberg.
https://www.lumberg.com/main/index_eng.html
I think I can say without fear of contradiction that it is most definitely not a DIN connector.

Thanks very much. No matches on Lumberg's current product line, but they do seem the most likely candidate. Perhaps a discontinued item.