This page has links to photographs of vintage calculators on this website.
Click on a calculator to see a larger photograph of it, then click on your browser "Back" button to return to this page.
Calculators marked "Details" are not in the book "A Collector's Guide to Pocket Calculators", but details are in the section Calculator Book Addendum on this site.
Office International
Office International 8002. Details.
Okhai (Scotish marketing company)
Okhai 8P. Featured on British calculator site.
Olivetti (Italian company. See the Calculator Companies section for more information.)
Olivetti Divisumma 18, calculator with an iconic design. Featured calculator.
Olympia (Euro-market, many calculators similar to Panasonic models)
Olympia CD46 (Euro-market), Panasonic 8203 (JE-8203).
Olympia CD76S, inside. Details.
Olympia CD81. Featured calculator .
Olympia CD91. Details Jan. 25.
Olympia CD101, inside. Details.
Omron (Japanese company)
Omron 8, type 1, aka Omron 840.
Omron 8, type 2, aka Omron 88R.
Omron 87, in clear carrying case, inside.
Orion (please let us know if you have any information about this company).
Orion, unusual since the battery compartment is detachable and can be replaced with an AC module.
Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2025.
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