Watch List notes:

SWEDEN. Christopher Polhem. 1661-1751. AR Medal (34mm, 12.73 g, 12h). By Carl Erhörning. Undated, but struck 1806. CHRISTOPHORUS POLHEM R · COLL · COMM · CONS ·, bareheaded and mantled bust right; E on truncation of bust / OPERA INTER TALIA PRIMUS ·:·, mechanical device lifting stone block INVENTIS MECHANICIS/DE PATRIA OPTIME/MERITUS · in three lines in exergue. Delzanno, p. 1104; Hildebrand, Minnespeningar 3. Iridescent toning, hairline die breaks, some marks, traces of underlying luster. UNC.

From the J. Eric Engstrom Collection.