Not the N600 but I did use the 160 back in the day...1987😀. In high school my father said I had to learn how to use a slide rule before he would buy me a calculator.
I've been looking for the N600 as a collector for my collection but they are pricy.
Wow...Beautiful example!!! Lovely color on the dial and hands. My dial looks similar, a shade lighter, but unfortunately along the way the hands were replaced, but they are tritium.