Vintage Alton Silver Conical Kinetic Ring Sweden 1960's

A vintage solid silver kinetic ball cone ring - a loose ball sealed in an open inverted conical form on a reverse tapered shank - marked for 935 silver for Alton of Falkoping - total weight 10.5grms - dimensions of face diameter 16mm height 13mm - currently approx size L AU/UK (US 5.5) - c.1965 Sweden