Chemical Paint stripper, no need to mask off the handle as it will not damage it but it may dry it out and require oiling afterwards.
Just apply the stripper evenly and give it time to work, maybe a few hours or so then come back and see if the paint is bubbling up. Once it looks like its coming off nicely you can then start scraping away the paint with a plastic scraper.
Make sure you get all the paint off, then you can wash and dry it. Afterwards, if you really want the comp finish look you can have it lightly bead blasted to remove the gray 'decarb' layer on the surface.