Half-groat, 1557, Vilnius mint
Sigismund II August (1544 - 1572)
Obverse: Ninth Eagle.
Lettering: SIGIS AVG REX PO MAG DVX LI 
Reverse: Fourteenth Knight. Roman number "I" is in the date.
Lettering: MONETA MAGNI DVCAT9 LITVA / I557
Identification
Ivanauskas, E., Cesnulis, E. (2016). Lithuanian coins of Sigismund August 1545-1571. Kaunas: Author
number: 4SA228-50
Rarity: R (Not more than 100 pieces)
Ivanauskas, E., Česnulis, E. (2014). Lithuanian half-groats of Sigismund August 1545-1566. Kaunas: Author
number: 4SA228-50
Rarity: R (Not more than 100 pieces)
Ivanauskas, E. (2013). Coins and Bars of Lithuania 1236-2012 (Vol. 1). Kaunas: Author
number: 4SA228-50
Rarity: R (Not more than 100 pieces)
Main data
Denomination: Half-groat
Value: 0.5
Currency: Groat
Year: 1557
Type: Regular
Minting
Mint: Vilnius
Minting type: hammered
Engraver: Jorge Behm
Parameters
Material: Silver
Fineness: 375
Diameter (mm): 19
Shape: Round
