That's interesting. it's got a 1950's vintage "Aerial Base No.28" - the larkspur VHF aerial base - fitted to the top plate. Also, the power supply case appears to have been modified to suit the long strap of the Carrier No.25. (According to the drawings, ther should be an adapter plate fitted to the 4 holes in the supply unit (the ones with blanking grommets fitted in the photograph) that has reverse keyhole slots to take the adjustable plateon the securing strap.
This one presumably had the slots re-worked to point to the right, and the original slot cutouts covered up.
Chris.
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