It's been over 30 years. But yes, come to think of it, I think it was grape.
And in reply to tetris11: Yes, there's grape juice everywhere, but not like this. This wasn't Welch's. If this stuff had been alcoholic, I would have been in trouble...
My advice, find a local winery and see if they sell grape juice. My local wineries sell amazing grape juices that are nothing like welchs in wine bottles in Northern Ohio, I assume they're similar to the kind you're looking for.
Edit: just noticed that you wanted sparkling, this may not apply