It's "Adapter, Aerial Base, No.1", and is a late WW2 designed piece of equipment. (The WS62 has stores codes in the ZA.3xxxxx range and was definitely around in WW2 according to WftW Volume 2.)
Anyway, the adapter was such a useful bit of kit that I think it is still around today - it was definitely used with Larkspur HF sets, and almost certainly with Clansman . The early ones will be stamped with the ZA.27220 stores code, and the later ones with the last 7 digits (two groups) of the NATO Stock Number.
Chris
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