There's a page on Andy in the Haynes Fender Bass Manual. Of his grey Jazz, it says...
It's a 1973, bought for £165 in Autumn 79.
Originally sunburst with tort plate. He sanded it down and sprayed it battleship grey with car body paint. The original scratch plate was sprayed orange but it's now black (it doesnt explicitly state that it's a replacement plate).
The back pickup is "very nasty and twangy". Strung with roundwound Rotosounds in medium guage.