Wire or Metalwork Seal, Double-headed Eagle, Image & Found by Mlýnek Karel.
Found near the city of Brno, Czech Republic, 16mm.
N?TZ(Z or 7) // double-headed eagle displayed with shield on chest
These type of seals are sigle discs with a loop at the top (often missing as here) through which a wire attached them to rods or other metal work (often bronze vessels such as cauldrons).