Very interesting tool you found there.

As for the numbers.

Maybe it's the address where you can ship it to for repairs.
I seem to remember reading on a Wenger booklet that they stamped Wenger/Delemont/Switzerland so you'd always know where to send your knife for repair if needed. And the Zwilling factory is located between the numbers 14 and 22. So that would make it street number 18/room number 8? (German/Austrian addresses sometime come in this format, 21/2/8 - I'm guessing street number / floor / apartment ? )
http://www.zwilling.com/de/impressum.htmlI'm totally guesstimating here and all I said could be complete nonsense.
It seems though it was made post 1969 going by the logo.
