Liege
Bishopric. Sede Vacante Patagon 1763 AU Details (Stained) NGC, KM166, Dav-1588. Underlying silvery-gray surfaces. Although noted by the grading service as stained, the odd colorations on this coin seem to be simply unusual toning patterns.
From the Engelen Collection of World Coinage
HID02901242017
Estimate: 800-1000 USD