Vintage Franz Scheuerle solid silver modernist ball and halo ring

A vintage solid silver modernist halo ring featuring a large solid silver ball sitting above a slightly larger silver ring on an adjustable band - marked for Franz Scheuerle of Germany and 925 for Sterling - total weight 19.7grms - diameter of face 25mm height of ball above finger 18mm - current ring size approx L AU/UK (USA 5 1/2) - adjustable - c.1970 Germany