I've stripped a couple of frames recently: 1952 Bertin + 1961 Holdsworth Cyclone.
But I'm fairly sure the paint wasn't original.
Used Bartoline TX10 Paint & Varnish Stripper -
https://www.amazon.co.uk/Bartoline-5...QXC/ref=sr_1_6
Actually worked quite well: (apply, leave for 1 hour, scrub with red scouring pad + washing up liquid) repeated a couple of times.
Finished using a dremmel with a wire pen brush