I had some success in removing 4 successive over-sprays from mine with acetone & Q-tips, so that I could actually read it!
Most folks tape them over, then remove the tape before it cures hard IIRC (it was on another topic here a while back), with cutting while paint is still somewhat soft in order to avoid rips & tears & cracking of fully hardened/cured paint as you remove the protective tape.
Hopefully ScottyB, McMark or one of the other painting gurus will speak up as to that technique & relative advantages/disadvantages.
The advantage to saving is it's original & you don't have to track down a bank check punch machine that George recco's to punch in your VIN & build date.
The disadvantage is you have to work around it on any strip, prime/repaint work & it's the 35+ year old sticker.
IMHO - I'd try to preserve the original one, as I'm doing with my resto - but I got a new repro from AA just in case & have photos of my original sticker for proof/record. I wish the prior painters had used the above simple technique on mine back in the 70s-80s when the resprays were done!
MINE - BEFORE/IN PROGRESS WITH PAINT OVER-SPRAYS:
Click to view attachmentAND AFTER REMOVING 4 OVER-SPRAYS (Tan, Gold, Copper, Grey Metallic over OE L80E Light Ivory):
Click to view attachmentHope this helps some.