Calculator Market

Until Sinclair arrived on the scene, electronic calculators were bulky devices confined to the desktop or briefcase. The Sinclair Executive (1972) was the first true pocket calculator and started a revolution that briefly made Sinclair the king of the calculator market.

Because Sinclair calculators were widely sold, most models are still fairly common today and so have a generally low value. The Executive is much sought after, as the first pocket calculator. The Sovereign is much rarer - particularly the limited edition Silver Jubilee versions - and the almost insanely fiddly Wrist Calculator is rarer still.

Please note that items offered for sale through eBay are usually second-hand and sold without any guarantees of any sort. They may well be sold without packaging or instructions, and may not even work at all. If you have any queries about an item being auctioned, please contact the seller. Planet Sinclair cannot take any responsibility for your transactions on eBay. Always ensure that you know what you are buying!

Any Sinclair calculator
Calculators	Production Date	Rarity	Value *
Cambridge	1973-74	Fairly common	£20-25
Enterprise	1977-78	Rare	?
Executive	1972-73	Very rare	£100+
Oxford	1975-76	Common	£15-20
President	1978	Very rare	?
Scientific	1975	Fairly common	£20-25
Sovereign	1977	Very rare	?
Wrist Calculator	1977	Very rare	?

* Note: this is a rough estimate based on the typical sale value of the item on eBay. The actual purchase or resale value may differ significantly.

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© Chris Owen 1994-2003