Listening to this and not knowing it was a German band called the Eyes, no NOT THE UK GROUP the EYES, you might reckon this to be an Everly Brothers demo/outtake. Or not, but it does sound American... atmospheric and forlorn.
This group is said to have been from Bad Homburg (Hesse?!), and as far as I can suss, this track is a live recording; it was on the Hessischen Beat-Festival 1967 LP. They also had two more tracks on the LP, "I Take What I Want" and "6-3-4-5-7-8-9." I think those three tracks represent their entire recorded catalog. I only know the group from the Prae-Kraut Pandaemonium series; their "A Stitch In Time" was included on volume 8.