This is the mysterious puzzling artefact in my collection.. The seller addressed it like am ancient viking face figurines(idol ?) and 'rare'.
Rare indeed it must be, because up til now I haven't found an satisfying parallel to it.
The figurine - with a face that seems to be 'griimacing' - is made of stone with lead within it. I recognised the lead appearance as I have also gaming pieces with lead within from the more convential viking area (England).
It measures app. 38 mm hight, 19 mm width at the broadest points and is app. 10 mm high on the hoghest point - the nose of the figurine
A possible parallel I have found in the book Viking Rus - Studies on the Presence of Scandinavians in Eastern Europe by Wladyslwa Duczko.
An image of the illustration/drawing of an exact size (Illustrations, Fig. 72. Shestovitsa: Norse finds from settlement site illustration c. of stone (not mentioning the type of artefact, just 'of stone').