Was in Zurich about 5 years ago. There were several excellent knife shops. In addition a number of tourist souvenir shops down in the Old Town had very good selections of SAKs. Department stores and jewelry stores also carried SAKs, sometimes including specially marked knives. Check the local Yellow Pages. Best place I found for older knives was the flea market, every Saturday morning down by the lake. Keep your eyes open as you're walking around, SAKs are everywhere. Good hunting!
Karl