Hendrik, I have been wondering the same as you for many years. I have been collecting non boxed & boxed, mono & stereo versions of UK vinyls since end of the 80's. So far I have never seen or even heard of any Mono versions LK4838 that would be in existance. Not even on e-bay. I am beginning to be pretty sure that a mono version do not exist.
It actually is listed in one of the existing "Worldwide Rolling Stones Discographys" that I have. That is the one made by Luca Accialini. His homepage [
www.betweentherecords.com]
still lists the Mono non boxed to be existing.
Luca, if you read this, can you give us your comments, based on what information do you list it to be existing.
Jan Richards / NSV Finland