Thunder IIA Navy (1983/4 maybe) Gumtree in AUS

Not mine. I have a white one.
https://www.gumtree.com.au/s-ad/magill/guitars-amps/1983-westone-mij-electric-guitar/1288301753

Ohhh, now that has to be my favourite colour on a Thunder (anything really).

I am fortunate in having two Model 1-A's and they are amazing guitars. But I love the look of the Model III's.

I'd sell my ancient Norwegian Grandmother for one
The only thing that would make me hesitate is the stop tail, which is also found on the Prestige line.

The tendency for these beautiful items to self destruct has been well documented in these forums. And when it goes, you are well and truly buggered. There is no replacement short of making one or major surgery to the top.