Nearly sure due to the uncommon configuration of the bayonet lock:
VG95234 cylindrical reverse bayonet coupling, probably pinout 16S-1 (7 #16 contacts).
Made by Souriau, Glenair, ITT Cannon, Amphenol Air-LB..
Based on a German adaption of the threaded Mil-C-5015 connectors, therefore the 'VG' designation.
AFAIK there is a British adaption of it. There is some lettering just visible on the locknut. If you post that, I could verify this info.