I believe this is the system 11 sound board version, that usually came along with the factory diamondplate playfield. This has the "fatter" side rails and the start button that stands proud of the cabinet. All older sys. 11 features. I don't know if I have seen hard production numbers on this version but people generally think about 200 of these were built. Full disclosure, I have one of these also and can pick them out of a lineup a mile away.
Looks like a nice pin, and is the factory more rare/early version, not just a CPR PF swap that also shows the diamondplate logo. Who knows value in today's crazy market. With these noted features and if the game is as clean/original unfaded as it looks in the pictures it might be worth asking. I agree more pictures are needed, bahind backbox, under PF, and lots of closeups to show real value.