Post-WW2 civilian services (Fire, Police or Ambulance), I think.
Although it might just be a bodge with the mounting cup replaced by a flat disc.
(I have a new one which has the flat disk with captive nuts for the retaining ring, a rubber gasket, and the retaining ring + screws, somewhere. I've also got a still bagged Canadian No.9 (with NATO stock number, so quite late) which has the 'bar type' retaining clip instead of the proper 'horseshoe' one, and I think this was because the manufacturer was using standard VHF Pye connectors - leaving it to the end users to change the clip if necessary.)
Chris.
Last edited by Chris Suslowicz; 11-03-17 at 12:38.
Reason: Typo.
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