Ugh. I refinish guitars and basses. I spend too much time getting finishes
right to want them to wear fast. But I have done some relicing (reluctantly) for a few friends (who I bust mercilessly for being posers). I think legitimate wear is hard to duplicate. Maybe even harder, since most major manufacturers moved to poly finishes by the time the 60's ended or even sooner (Fender switched in 1968, Gibson was still doing a few nitros (Explorers for one) in the '80s). That's where you get the "bowling ball" finish when you try to peel the finish off one of these basses.
There's a very complete site with all kinds of info about Fender manufacturing and finishing over the years. If you want to see pix of what real relics look like, they have every age and variety. If you do any finishing, particularly with nitro, it's an education (and a hoot, if you think Leo and company were in any respect, reverent about how they painted things).
http://www.provide.net/~cfh/fender.html
Poly finishes
are very hard to wear, don't check (fine, hairline cracks) like nitro and really don't amber with age. Keep in mind, most of the worn or reliced basses that are around are polyester or polyurethane finishes. That's why the bass pictured above, and the real oldies look different.
Nitro
can hold up well if it's babied, but if you kick it around a bit, it dings and scratches. Expose it to sunlight and it yellows (ambers). Treated rough, even a good nitro finish will dull up and wear in a year or a little more.
The original Highway basses had a matte acrylic - not nitro finish. I'm sure they will wear fast, as acrylic is soft. Personally, I hate the waxy feel of the acrylic they used. I'll probably own one sooner or later and have always figured I'd redo the finish in nitro. I haven't seen the new "thin nitro" finish, but I'm sure it will wear plenty fast. Whether it will make the new Highways look like vintage Fenders is doubtful. The real old guys have a lot of grime, aged, dried out wood and finish and other crap stuck to them. I strongly doubt that just having a nitro finish wear off a new bass quickly will look the same.
