Victorinox and Wenger have produced versions of the watch case opener mainly for the various Swiss watch companies. That's why most of the samples out in the wild have a company logo or name printed on the scales.
Mine has a "Nivada" company name. According to the history I read, Nivada is a swiss watch company founded in 1879 in the town of Grenchen, Switzerland. The town of Grenchen has a large traditional watch industry and some of the famous manufacturers like Breitling SA, Epos, Fortis and Titoni Ltd are based here. Nivada has since moved its manufacturing operations in Mexico in 2000 and re-focused its business towards entry level watches.
The "Elinox" tang stamp was introduced in 1957, it is not far off to say this particular SAK was produced in the 1960s.
www.sakwiki.com Watch Case Opener
Nivada Wikipedia page