I had just started this job and decided to get my camera since we've discussed it before. The thin putty knife closest to the tag has a narrow notch cut in it with a cutoff wheel. Then additional putty knives can be driven between it and the casting to walk the rivets out unharmed and ready to be re-used.
This tag has already had the original black paint removed so I'll just remove the sloppy red and polish the whole thing. I really prefer to keep original tags regardless of appearance.