There's the remains of a sticker on the right bottom corner of my windshield. There's enough left to make out what it says
This is what it looks like
Mine says fall 1982 below that is a 7 digit serial number. It does not match the engine number.
My question is, is it possible to look this number up and use it to re-register the car
You can go on to the Massachusetts RMV website and put that number in under a title search and see what comes up.