Coin was found with the aid of a metal detector. It was found with another coin and a piece of it is still attached to the reverse. An interesting item!

Obverse:

Bust of Sigismund III facing right.

Script: Latin

Lettering: SIG.III.D.G.REX.POL.MDL

Unabridged legend: Sigismundus III dei gratia rex Poloniae magnus dux Lithuaniae

Translation: Zygmunt III by God's grace King of Poland, Grand Duke of Lithuania

Reverse:

Inscription in three lines. Above, value in Roman numerals, Polish eagle, Wasa arms and Lithuanian Vytis dividing date. Below, Sas arms. 

Script: Latin

Lettering:

III
1621 GROS.ARGE
TRIP.REGN
POLONI