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Yamaha TRB 4P

Hi everyone, just joined the group.
Hoping I can get some clarification on a bass that I’m in the midst of purchasing.
The bass is in very good condition, the only problem is that it does not have a serial number on it anywhere.
It is usually on the headstock. I’ve tried to look into the electronics cavity and there is nothing.
How would I know that this bass is authentic.
Also, how would I know that it is made in Japan and not in Taiwan.

Greatly appreciated