I have restored a few early 70s machines that had been repainted and had good results with this method ! I use
normal paint stripper.Paint on stripper approx a square foot at a time.As soon as the stripper begins to bubble (around 15 secs) scrape off with a putty knife or similar.Dont put paint stripper on too thick.Get a "feel "" to how long the stipper needs to stay on.If done correctly you should be left with the original design.