Bulgaria
Alexander I copper Essai 10 Santim 1880-OM MS65 Brown NGC, KM-E1. A decidedly scarce pattern issue struck by Oeschger Mesdach & Co. with a reported mintage numbering only 8 examples. Underlying luster with deeper toning in the centers and a lightening toward cupric red at the peripheries.
From the Engelen Collection of World Coinage
HID02901242017
Estimate: 2000-2500 USD