That's a tired Black Knight which would be a great project if the playfields were still available (or rerun) and a repro backglass was available. I'm sure someone has bought a repro playfield set and has waited for a BK project like this.

Boards are available, and if this was a "Holy Grail" machine and the parts were available, it would be a great base for a ground up resto. Don't think you would get your money back, but it is a challenge !