Start with a DC motor.
"Field: PM" on the tag means it is a permanet magnet motor. The brush holders may or may not be exposed.
Low voltage and low RPM is like the Ametek etc tape drive motors. Probably will not find one at the local junk store.
Best chance is finding a 90V DC PM motor. 13V / 90V X RPM = Charge Cut-In RPM.
So a 90V 1700RPM motor will start charging a 12V battery at about 250 RPM.
The name plate amps is about all the amps that can be safely get out of them.
A 1/4 HP 90V DC PM motor may be rated at 2.5A meaning it can make 40W, more if you push it. A 1/2HP may be rated 6A. Bigger is better.
Some people push them harder than others.
Look for motors with bearings instead of bushings.
Do not get anything with gear reduction, or a gear box on the end.
I doubt they will have anything great. Never know.
G-