G.P.O. Bracket No 10
Wall or Fascia Bracket
The Bracket No.10 has three fixing holes for mounting on a flat surface and supports a single spindle. Often used with a bolt in lieu of a spindle for a dropwire clamp, as in this example above.
The bracket can be made from either galvanised cast iron or an unfinished cast aluminium alloy. It measures 3¾″ wide, 3¼″ high, the centre of the bracket hole is 3¾″ from the rear of the bracket
RingBell : GPO Nostalgia Web site