Thank you for such an interesting and detailed answer!
Since you touched on the topic of Wilis jeeps, I have one more key, which it was equipped with for repair, from company Fairmont!
I will clean it up and post a photo
This is the key that was found in Belarus, the former republic of the USSR. Apparently he came to us during ww2 through the lend-lease assistance program! Was found at the site of military battles!