Yeah, the model name is just "world", there was one model up called the world sport. Yours is probably a mid 80's model most likely made in taiwan. It's not a really high end model, but it's a very nice quality solid bike. Since you plan on flipping it, don't put a lot of money into it. Get basic cheap cables and tires for it and give it a good cleaning, the bearings probably need to be repacked too. 25.00 is a good price for any bike, you got a nice solid one with a well recognized name.

It looks like it has suntour components, that would be a nice plus also. Here is an 84 schwinn world on velospace that is very similar to yours: