I have a very low-tech way of labeling my punches that has worked very effectively and takes no time to accomplish.
As soon as the punch comes out of the wrapping and I know it works, I use a super-fine point permanent marking pen and write the name of the punch, the date purchased, and the maker on the underside of the punch on the metal working part. I make sure to write on an area that paper won't brush against and wear off the ink. There is always an indented portion of the metal underside that is counter-sunk from the rest of the metal and the ink adheres well to it. It's not a glamorous way to mark the punch, by the same token it doesn't "ugly it up" either!
It's quick and easy to do and if I make a mistake while writing, the ink can be removed with a bit of rubbing alcohol on a q-tip. I like simple solutions and this one did the trick for me. :cool: