Well, that rear tire looks like it has more than 3K miles on it.
It has a dual rear sprocket mod, which is pretty cool.
It has a home-brew high front fender mod, using the stock fender.
Turn signals have been removed.
First impression... I think that someone made this in to a dirt bike, and probably rode it pretty hard.
That's not necessarily a bad thing, and if you can get it for $1200, it might be a pretty good deal!
However, since you don't have much experience with motorcycles, maybe you should bring an experienced friend with you.
Honestly, you'd probably be money ahead to spend twice as much on a newer, less ridden, less modified bike.