Watch List notes:

Germany. Duchy of Saxony. Goslar. Otto III 983-1002. AR Denar (19mm, 1.49g). OTTO [ADELDEID]A, head left / +[D-I GRA + ]REX (retrograde), cross, in angels O D D O. Dbg. 1164; Hatz Typ I.2c; Kluge 46. Fine, flat spots, green deposits on obverse.