There were a lot of really nice and not too well known things that came out of Yamaha in the 70s. I'm not familiar with that bass but Yamaha was making some first class acoustic guitars during that era . People wouldn't even give them a second look in the music stores because they were Japanese but they were about half the price and twice the quality of just about anything out there. IIRC you would be hard pressed to pick up a Yamaha acoustic with a price tag of over $200 at that time and most people just walked right past them and spent a whole lot more to get a whole lot less from the mainstream brands.
I remember the Yamahas being displayed on the opposite side of the store from Gibsons , Martins etc. and packed in with the Crestwoods, Teiscos etc.
Rick