Sterling silver Brutalist Modernist necklace & pendant. 1970s retro jewellery hallmarked 'London 1973 A C Co'. 24" chain, textured trapezium

A beautiful retro pendant with necklace.
The pendant is sterling silver (hallmarked London, 1973, by A C Co - or so I believe).
It's Brutalist or Modernist style - random aggressive ridges/shapes/holes on a trapezium shape, with contrasting bark textured sides.
Please study photos.

The chain is very fine and lightweight and most likely silver. It's 24" long.

Quite a statement, quite possibly unique. Perfect gift idea!
45x21mm.

Price includes P&P.