If it was one of his personal guitars that he used they can go six figures..
You can buy this one for $1288 and signed by Sammy Hagar, Eddie Van Halen, Michael Anthony, and Alex Van Halen. Supposedly authenticated by a 3rd party. Whatever that means.
https://gr-8-gift.com/product/van-halen-band-signed-esp-red-metallic-stratocaster-styled-electric-guitar/?gclid=CjwKCAiA_eb-BRB2EiwAGBnXXvv0RuFGvmDiKpsHQiR7rHnjc77qdR8ezRSOr9 gtU0-EHuAozv8biBoCRcoQAvD_BwE