Amazing stephanite crystals on pyrite, a combination i have never seen before from Freiberg. The piece is a full floater cluster and very well crystallized on all sides. There is an old label from the famous collection of Friedrich August Frenzel (1842-1902) coming with the piece, dated to 14.4.1901 and another one from Anton Berger, dated 21.9.1956. Superb European classic of great importance and historic value!