The Sovereign was produced from 1976 and named to commemorate the Queen's Silver Jubilee. It was an attempt to move up in the market and Sinclair designer John Pemberton won a design council award for it.
It was small, slim, made from pressed steel and available in a range of finishes.There was black painted, satin chrome finish and silver or gold plated. A small number of solid gold models were also produced.
A chrome plated model cost about £30 in 1976.
It's downfall however was that it still used power-
Display : 8 digit Red LED
Functions : +, -
Batteries : 2 X watch batteries (2.5V)
Integrated circuit : Mostek MK50321N
Black painted version in clear case.
Black painted model with higher quality case
This one probably made for a Ford employee
A version made for the Plessey company.
A gold plated version, costing £60 in 1976.
This is the silver-