United States - 1972
Director - Stuart Rosenberg
Starring - Paul Newman and Lee Marvin
These top two posters are from IMPAwards
I don't know what Retro Filmprogramm is but issue 49, which I found at rudolfbenda.de features Pocket Money under the title "Two Unlucky Cowboys".
This VHS box comes from 109 Things.
I was hoping for a nice old mass-market paperback with an illustrated cover or something, but the only cover I could find for the novel upon which Pocket Money was based was this contemporary one. The screenplay for the film was written by Terrence Malick who has also directed a few films you might have heard of namely The Thin Red Line which was based on a James Jones memoir.