2 - Williams Main Board - System 3

Here are 2 Williams Main MPU boards. I'm not exactly sure which system they are from. They are either System 3 or 4. System 3 games are Contact, Disco Fever, Hot Tip, and World Cup and System 4 games are Flash, Phoenix, Stellar Wars, and Pokerino. Both boards have the numbers: 1D-20001-133-3 on them. One board has Flash ROMs installed on them. There is one chip missing on the board with the Flash ROMs. Both of these boards are in unknown condition. From looking at them, it appears you could make 1 working board from these.
If you have any questions, please feel free to contact me.
thanks