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My guess is that these are all low peripheral, but open to other thoughts.

1. Has gold pins, and would the buttons all likely have silver? And displays are okay value, right?
2. No heavy junk, but maybe not enough higher value components to justify high peripheral for the size of the board?
3. Visible gold on board and underneath buttons, and Buttons = Silver = Good?
4. Gold pins, but chips are a bit sparse.