Sad to see a nice vintage Foster G-1 messed up like that..
Still, the seller does not claim the artwork to be all original. I can sort of understand the people who pick up an original stock G-1 for about 100 USD, then customize it with a patch or two and nose art on the back. Throw in an old picture bought on eBay for a tenner, and some papers... and you can sell it with great profit...