Watch List notes:

ITALY. Siena. Repubblica, 1404-1555. ½ Scudo ND, Siena. Obv. SENA VETVS CIVITA VIRG. Ornamental letter S. Rev. ALPHA ET O PRINCIV E FIN. Cross. MIR cf. 572. AU. 1.57 g. - VF
Ex. Christie's Milan live auction 2532, 29-30 November 2011, lot 1460.
Extremely rare; wavy flan.