I think you're on to it, but because the OP said it was made in 1980, it might be more like this GR-33B:
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I'm no expert on which models were made when, so this is just a guess.
They're rare, and a lefty even more rare. I need another bass like I need a hole in the head, but if I ever get a chance to get a GR-33B with its floor unit in working condition at a reaonable price, I'd consider it. I heard someone playing one years ago and it's fantastic.
