My estimate is that this coin had been in a fire, the reverse has some hints of scorching or high heat and the coin have been cleaned that may explain the tiny black dots on the coin reverse surface. The case it was in was likely totaled. The Obverse has been spared the brunt of the heat, toning had been artificially accelerated. Still Legal tender and 0.720 Fine Silver with pretty Butterflies. Yes the Butterflies.
Thanks for the comment @chekohler
My estimate is that this coin had been in a fire, the reverse has some hints of scorching or high heat and the coin have been cleaned that may explain the tiny black dots on the coin reverse surface. The case it was in was likely totaled. The Obverse has been spared the brunt of the heat, toning had been artificially accelerated. Still Legal tender and 0.720 Fine Silver with pretty Butterflies. Yes the Butterflies.
Thanks for the comment @chekohler