A very nice, rare ducat from the time of the co-reign of the three brothers.
The characteristic legend of the reverse, also known from the ducats of Chrystian Volovsky -"thy grace is sufficient for me, Lord".
Obverse: half-figures of three brothers in front, floral ornament below them. In the rim:
D G GEORGIUS LUDOVICUS & CHRISTIAN FRAT (apple).
Reverse: emblem of the principality with the letters E-W on the sides. In the rim:
SUFFICIT MIHI GRA - TIA TUA DOMINE 1661.
Reign: Jerzy III Brzeski Ludwik IV Legnicki and Krystian Wołowsko-Oławski 1639-1663.
Mint: Brzeg.
Gold, diameter ~22 mm, weight 3.48 g.