Vintage Danish Modernist Sterling Silver Ring Siersbol Signed

Estimated circa 1960’s. Simply Modernist in every way, made in Denmark by Hermann Siersbol, signed as shown and also marked 925S It is an adjustable ring (they usually are) currently set at a size 7.5 The ball is about 9mm across and the shoulders of the shank are about 5mm at the widest, tapering to a touch under 2mm The ball stands off your finger by about 3/8”. It is in excellent vintage condition.