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This calculator is a special edition 18R, made
to celebrate the Bicenntenial in the United States in 1976. As such the casing has
been changed to have a red, white and blue theme (see the three-quarter
view on the right---click image to enlarge). The outer casing and the
numbering details are all blue, with bright red keys and a white
upper casing. Other than that, it operates
exactly as an 18R. The calculator was built in Mexico, as the expected
market would, I presume, be limited to the U.S. Which is a pity, as I
prefer this colour scheme to the standard!
This Rockwell '76 has its I.C. labelled 7537 (1975 week 37).
The manual for an 18R is available on the manuals page.
Try out the calculator---it works!