I say it is NOS or new guts repainted for this reason. If you look at the strap for the wiring harness (either black plated or flatter shade of black) it is still different in color then the rest. and the rivets are a gloss finish. so it was either all apart where the rivets/mount were removed or someone did an awesome job of masking it off,or its nos. like many have said without in hand very hard to tell

Never was aware that these could even have been rebuilt with new guts put in them.