Silver, 34.7mm diameter, 22.12 grams.  ERNST AUGUST V. G. G. KOENIG V. HANNOVER His bare head right, A below.  Rv. EIN THALER  XIV EINE F. M. around crowned arms, 1842 below.  Craig 71d, KM197, Dav 672-3.  Many surface marks in field, otherwise Fine-GF.