A little afternoon metal detecting in one of the old yards at a home soon to be demolished yielded my oldest NJ License Plate to date-1921. This one has only numbers and no preceding county initial. All cleaned up, painted, and hanging on the bottom of my collection. Also found an old buckle? of sorts and a Divine perfume bottle.View attachment 1354854
Very nice! The oldest plate I've found in decent shape is from 1930. Glad to see you had fun with it and painted it. I soak mine in citric acid to remove most of the rust and then give them a couple of coats of clear coat paint, which helps to keep the rust from coming back.
Trezurehunter, To remove the rust from my old license plates I use Loctite naval jelly rust dissolver (photo) which I bought at Lowes. After initially wire brushing and hosing off the plate I apply the jelly with a brush and let sit for about 10 minutes or so. I then hose off the plate and if necessary repeat the process. It works pretty good. I then spray paint with rustoleum and hand paint the numbers and letters also with rustoleum.