I used to make those old school labels. You need a stamp machine.
That's the hook. Prety expensive I imagine. Maybe evilbay.
You might get away with a typewriter, then clean off the ink.
They would usually have the company name and a few other bits of info, and then there would be blank areas where you would stamp in such things as model and serial numbers. They had em in red, black, and a few other colors. They would really spruce up a clone, like the back of a LA2.