I have an Artia EB-3 copy that seems to share some parts with the one you are looking at. I have a friend who is a Japanese guitar nut and he dated it around 1974 from the Matsumoko factory.
The bass itself has the issues mentioned above. The bridge and tuners are not great, but they get the job done. When I gig the bass, I check my tuning a little more than with my other instruments.
As far as sound goes: It sounds freaking awesome. When I got it, the pups were way too close to the strings. I lowered them, put some fresh strings on- instant vibe. Very cool bass. With a touch of overdrive I can get close to Allen Woody's early Gov't Mule and ABB tone.
Since purchasing my Hagstrom, the EB-3 has been sitting in her case. I really need to pull her out or sell her.
My advice is, if you do buy the one you are looking at, you will likely have to put some work into it. Maybe replace the bridge and tuners. Possibly a pick up replacement. If the bass has a vibe you like, it might be worth it. Save the original parts, some folks find these collectible.