The Victorinox Scientist Swiss Army knife is the smallest Victorinox pocket knife that includes a magnifier.

This model has been retired for many years, and it is definitely scarce enough (and popular enough) to be a valuable collector's item. If you just want a practical knife with a magnifier, consider an Explorer instead. The Compact is also a reasonable substitution if you can do without the magnifier.

Compact-- scissors instead of magnifier and phillips screwdriver
Explorer-- ads scissors, hook, awl, can opener. No pen or mini driver.
Explorer Original-- adds scissors, awl, can opener. No pen or mini driver.
Explorer Plus-- adds scissors, hook, awl, can opener.
Passenger-- adds small blade, separate can opener and bottle opener (retired and rare)
Yeoman-- adds scissors (retired and rare)