My friend here in town has checked his set and the aerial base is apparently an 'AERIALBASE No 10 Mk II' with ZA14172 and PC825740 also cast into the rubber. The Control Unit is a No.2 Mk II, which if the correct model, also raises the question of how the unused 12-pin socket was protected from the elements. Were protective caps ever issued for these things?
Also looks like four cheesehead screws hold the mounting plate in place as Chris noted.
David
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