This is a mid-1970s calculator which looks very similar to Rockwell's offerings of the period such as the 24RD-II. Well that shouldn't really be a surprise, if you turn it over you will see a Rockwell sticker on the back!
The calculator is a bit battered but works perfectly well. It has the four arithmetric functions and percentages, though lacks memory. Numbers are displayed on a vacuum fluorescent display.
