I don't think the BATF has allowed numbers to be re-stamped...ever...but certainly not for quite a few years now. When guns were re-stamped it was with an ATF assigned number and there was paperwork that had to accompany the gun at all times.
I don't believe there was ever any "freshen up" procedure. No insult intended to anyone but speculation about felonies is never a good idea. Please read the 2nd page carefully.
