Willy Steinlin (St.Gallen, Switzerland) was mainly working in pottery, but also has designed several glass items. His Olma Cow (as a butter dish) has already been discussed
here.Another one of his glass designs is the Owl - like the Olma Cow used for several items. Right now there is a
pendant on ebay - the
seller has provided me with an improved image for this board (below). There is also a 30 cm diameter
cake plate on ricardo, made by
Glasi Hergiswil (but no longer available there).
As for the "pendant" - I am not quite sure if that is the correct translation: far too heavy to carry it around your neck: it is meant to be displayed in a window.