The link below points to the website of a German knife collector & knife friend who collects various old school Solinger Fahrtenmesser (or Scout knives as they are called in the rest of the world), which i also happen to like quite a bit.
The website is meant only for showcasing his beautiful and still expanding collection, not for commercial purposes, and the owner is a very friendly fellow, who also reads & writes in English.
https://www.solinger-fahrtenmesser.de/