Tapio Wirkkala 1915 - 1985 This is the large version of the Hopeakuu (Silver Moon) Executed 1973, stamped NW U7 (for 1973), 925, Finnish hallmark for domestic silver Sterling silver pendant comprised of twelve concentric rings maintained by a central axis which permits the pieces to oscillate depending on the movement of the body; limited edition pendant designed by Tapio Wirkkala for Nils Westerback, Helsinki, for Kultakeskus Oy, Finland Tapio Wirkkala Please take a good look at the photos for all details. We leave all jewellery in their original state; we leave the cleaning and polishing up to your taste. All items are checked in-house by our jeweller and gemmologist.