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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.

1 I see no gold pins on it. mid grade, if it hass gold pins maybe low peripheral, IDK about the 7 segment display
2 peripheral. could be high, could be low, a board like that is a judgment call
3 mid grade.
4 low peripheral likely, but I see lightly plated gold pins and there could be gold in that serial connector. If there is gold in it too I would say maybe high peripheral

Buttons and display could be a plus for the value, but you have to know what's in them, these don't look like anything I've seen pointed out as good but that doesn't mean they aren't. If the plastic buttons come off the switches pretty easy I'd go ahead and remove them.

So 1/3 gave a chance at low peripheral.

2, I'm leaning high peripheral

4, low peripheral

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My grades are my own opinion and not an official grade from Boardsort