I think there's a very good reason the knife didn't sell for its asking price and is now re-listed. It has a few tells that tend to make me think it's not quite original. These include the year (too early), the maker (pretty sure Wenger never supplied these), the W-K stamp (Swiss Rail Soldiers were not stamped), and the bottom pin (on a Model 1961 from 1983 the bottom pin would have been hollow).
I don't want to impugn the character of the seller, and in fact I think I may have bought a knife or two from them over the years, but this particular knife has too many problems to warrant interest other than maybe as a reproduction or curiosity.
It is re-listed here:
https://www.ebay.com/itm/146332483504.