$57 is a great price, wow.
What your look for is condition, what to look for is in your FSM.
Note the belts below had ~90K miles and look like (new almost). What you can't see is pulleys or water pump. Tensioner can be removed and inspected.
If you pull skid plate off you can get a socket with breaker bar on large pulley/crank nut. Turn clockwise to inspect belt. Disconnect battery first. Tip: pulling spark plugs out, makes turning crank very easy.
If original; maybe, although white letter is most likely worn.
This has in been in my tool box for years. I use it to wrap crank pulley (harmonic balance) to protect for chain wrench I use to hold pulley. I believe (not 100% sure) it's the factory original from my 01.
I can see on a belt I just replace, which was a 2nd (not factory) "made in USA". It's very hard to see (need angle of light just right on right spot of belt) but is permanent on belt.
Since this thread is about Starters, perhaps it would be better if you use or start a different or new thread for time belt issues.