Scotish marketing company. The Okhai calculator was branded and marketed by the brothers Ibrahim Okhai and Aziz Okhai who came to Scotland in the 60's from Malawi. They started out as painter/decorators, and through one means or another, ended up as traders in many own-branded items, including the Okhai calculator. They sold everything own-branded from corned beef to drinking straws. Also, showing innovative flair they were very successful in a variety of fields especially packaging, in which they continue today in Dundee, and also marmalade and confectionary, soft drinks, and stationery.
Source : vintagecalculators.com