I'm not familiar with that brand, but those cutting-board bodies were pretty popular during the 70s and, yes, it's probably Japanese. Some of those basses were very well-made.
Based upon the ones I've played that were of similar construction, expect a mid-heavy sound and a lot of sustain. Those basses were typically outfitted with heavy brass hardware and hot pickups along the lines of the DiMarzio's that were all the rage with 70s rockers.
I'm guessing by your description that the neck is maple?
All in all, it's still going to be way similar to a P-bass in tone.
"People don't realize it, but the bass player holds the whole thing up like Atlas." -Some wino who talked to me on the subway on my way to a gig