The identity of this 'orchestra' has not been revealed, but we do know that this single is produced by a certain Werner Schüler, which leads me to conclude that this is a German outfit. But if you know more, you are welcome to post in the comments!
My collection: 7" single no. 7069
Found: Record fair, Den Bosch, 11 November 2023
Tracks: 'To the unknown man' / 'Cascade'