The best answer to this question is, it could be a good radio or it could be a paper weight. There are two ways to find out.
1. You could get new batteries, or cycle the old ones, and hope for the best.
2. you could pay to have it tested and be out more than it's worth.

I personally wouldn't recommend either one, but you may be lucky and get a great radio out of the deal. I still fly some early 90's radios and they work great, but I have owned and cared for them since day one. If my old 70's Kraft was converted to narrow band I would still fly it. It has the smoothest gimbles I have ever used, and never glitched once. Just remember no matter what anyone says they do or believe, your results may vary. Just remember "flying, to an even greater extent than the sea, is extremely unforgiving." (sorry can't remember the exact quote or who to cite.)