 The Sovereign was unusual because the casing was made from pressed steel , which gave it a much higher quality feel compared to injection moulded plastic . This allowed a variety of paint and plating options , including black painted , chrome @-@ plated , silver @-@ plated , and gold @-@ plated , and a limited edition silver @-@ plated version , inscribed to commemorate the Silver Jubilee of Queen Elizabeth II in 1977 , were also produced . <unk> of London was rumoured to have produced two <unk> in solid gold , costing GB £ 2 @,@ 750 each . 
