I haven't used a typewriter in years though I still have a transparent typewriter that I picked up at an auction. It was originally used in the prison system. I suspect the design was to make it hard to hide contraband. The one I have is a Royal Typewriter unit from the 1960's so everything is manual.
I think you can still buy clear typewriters from
Swintec but they are electronic so not quite the same appeal for me.