Half-groat, 1556, Vilnius mint
Sigismund II August (1544 - 1572)
Obverse: Seventh Eagle.
Lettering: SIGIS 
AVG REX PO MΛG DVX LI
Reverse: Thirteenth Knight. There is no interpunctuation between "9" and "LITVA".
Lettering: MONETA MAGNI DVCAT9 LITVA / 1556
Identification
Ivanauskas, E., Cesnulis, E. (2016). Lithuanian coins of Sigismund August 1545-1571. Kaunas: Author
number: 4SA357-16
Rarity: R (Not more than 100 pieces)
Main data
Denomination: Half-groat
Value: 0.5
Currency: Groat
Year: 1556
Type: Regular
Minting
Mint: Vilnius
Minting type: hammered
Engraver: Martin Wartenberg
Parameters
Material: Silver
Fineness: 375
Diameter (mm): 19
Shape: Round
