Since that is a Canadian model made for overseas use my USA catalog model numbers are different but that looks like a Kra55a probably from 1980-1983 since the drawers don't have trim. Here's a scan from the 86 catalog, see if the specs match your box.

There should be a date stamp on it near the ID and serial number stamp. If that SO emblem is original that style of script block vs cursive started in the early 80s.