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Sumlock Anita Electronics Ltd. started making Rockwell calculators after they were bought by Rockwell International in 1973. This 18R was made at the Portsmouth factory, and is a basic four function model with an added percent and memory. Unlike the later 21R you have to remember that there is a value in the memory, and there is no special led segment for minus, so that negative numbers are restricted to seven digits. This 18R has its I.C. labelled 7603 (1976 week 3).
The manual for the 18R is available on the manuals page.
Try out the calculator---it works!