Sahara Plaque Registry - what a Great idea.
Here are 2 more $20-blues, could you add them to the registry?

Doc Finstuen 0860

(son) Kevin Finstuen 1796

When my son asked me "What's the difference between them?"
I replied "1136".

Plaques are stamped with serial number on both sides, so is there a obverse & reverse. Have any errors been detected?
Does anyone have a picture or photo of the plaques in play?