It's hard to tell from the information in the ad. As others have stated, it's looks good and well-kept. I would inquire about the maintenance history (timing belts, carbs, brakes, etc.). If the aforementioned items were satisfactory, I'd pay $2000.00 for it (but I'm a bit of a cheapskate).
That's gotta be the lamest craiglist ad I've ever seen. The only thing going for it is it has a picture and a phone number... and looks can be decieving. There's no way to know anything about that bike 'til you go look at it, which may be why the ad is the way it is... JMO.
If it is mechanically any where as clean as it appears and it is what you want, it would be worth it. But the information is lacking so you will need to ask some questions. If it works out for you, enjoy and ride safe!
If you're a collector it's worth it. If you want to buy it and ride, look for a bike that you can ride and maintain. I restore old Mustangs and the same is applicable there, it depends what you are going to do with it.