The Sovereign , released in 1976 , represented an attempt to move upmarket in an increasingly saturated market . In December 1976 , the chrome plated version of the Sovereign cost GB £ 30 and the gold @-@ plated version GB £ 60 , including VAT , but profit margins on the Sovereign was so small that Sinclair ended up selling the Sovereign at a loss , and it was not a commercial success . The Sovereign was made in England , like every other Sinclair calculator except the President .