Check out the rubber key covers. I’ve only seen those on a Royal Portable Standard “O” model on a YouTube video. I’ve never seen those on a desk machine. I personally don’t like the look of them. I think the glass keys are far more attractive. I suppose some collector may find the rarity of some value, though this machine isn’t in very good shape. I suppose someone who really wants those key covers could remove them and place them on another machine.