I just ran across something interesting and thought about your observation on the color of the decal.
In the 1981 Flat Top catalog they specifically refer to the PB80 having a silver logo rather than gold like lower models. Never noticed that before.
"PB80 has added a number minor changes and finally revived as a perfect old replica model. Newly developed old type pegs, spiral bridge, alder body, silver type logo, etc. are perfect in detall. It perfectly reproduces the old-fashioned feeling from the '50s to the '60s. The high-grade sound with hidden energy is not only dynamic, but also vividly expresses the subtle tone nuances of the bassist. It is a masterpiece model of the PB series."