The Sears #801.58190 is a Rockell 10R in disguise. Like the Sears 8M, it has been put in a stylish case to give it a new identity. The colour scheme for this calculator perhaps dates more readily than the 8M, with cream body with brown markings. None the less, a swish example of a Rockwell. This calculator was assembled in Mexico, as were all the Rockwells for the U.S. market, and it is unlikely to have had examples manufactured in Portsmouth (though see the Rockwell 20R obtained in France). The I.C. for this calculator has a date stamp of 7509 (week 9, 1975).
Try it out on the above image---it works!
A manual for the 801.58190 can be found on the manuals page.
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