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Looking at the perfin sheet brings up a question, if a stamp has perfins and has not been used, still has og, is it OK to use for postage?
You should be okay, as most perfins were discontinued years ago and the ones shown in the previous post "PRR" was for the now-defunct Pennsylvania Railroad, so I doubt anyone cares about it today.
Someone can correct me if I'm wrong, but I think perfins were initially designed as a security measure for the company or firm that used them; the USPS (formerly USPOD) didn't much care who used them, as they didn't enforce illegal usage; only the company that applied the perfin did.