While not conclusive, please review this German Made (Bonsa) Gravity knife from the 1950s. While the logo is worded differently (“fall” versus “fly”) it seems very similar as well. Here’s the website I copied the below picture from here History of the OTF
I have never before seen either styled knives you have posted. Hopefully, someone else on the forum has the right information for a conclusive identity.
Interesting! Are the wooden ones home made?
"Much that once was, is lost. For none now live who remember it."
No sweat, mate!