Sinclair Sovereign [SEP] service entry
Sinclair Sovereign
The Sinclair Sovereign was a high-end calculator introduced by Clive Sinclair's company Sinclair Radionics in 1976. It was an attempt to escape from the unprofitable low end of the market, and one of the last calculators Sinclair produced. Made with a case of pressed steel that a variety of finishes, it cost between and at a time when other calculators could be purchased for under . A number of factors meant that the Sovereign was not a commercial success, including the cost, high import levies on components,
Earl of Caithness (died 1582) (resigned 1545)
- John Sinclair, Master of Caithness ( – Sep 1575)
- George Sinclair, 5th Earl of Caithness (1566–1643)
- George Sinclair, 6th Earl of Caithness (died 1677) (resigned 1672)
- John Campbell, 1st Earl of Breadalbane and Holland (1633–1717) (resigned 1681)
- George Sinclair, 7th Earl of Caithness (died 1698)
- John Sinclair, 8th Earl of Caithness (died 1705)
- Alexander