The Mustanaamio Good & Skull Mark Ring Set were produced by R-kioski in Finland in 2010. Produced in Serling Silver, the ring set was exclusively sold throughout Finland and are fully licensed by King Features Syndicate.
R-kioski is a prominent chain of convenience stores operating under the Reitan Convenience division of the Reitan Group. Within the Group’s Eastern Nordic and Baltic portfolio, operations include R-kioski in Finland, R-kiosk in Estonia, and Lietuvos Spauda in Lithuania. As of 2017, the R-kioski network encompassed 560 locations across Finland.
In addition to its retail business, R-kioski produced a variety of branded merchandise for its stores, ranging from keychains and paperweights to bookends, party supplies, and select limited-edition collectibles.
The Mustanaamio Good & Skull Mark ring set are made of solid 925 Serling Silver with the top of the rings containing the Phantoms Good or Skull marks on a black background, with a closed hoop at the rear. Limited to 1000 units per ring, the rings were sold in specially designed black cardboard boxes with the insignias of the Good or Skull mark symbols printed in silver on the lift off lid



The rings were placed on white foam cushion inserts situated within a square-shaped box, which also contained a loose copyright tag printed in black and white. This copyright image and text are likewise displayed on the interior of the ring.
Advertisements for the rings were generated by R-kioski. An example is provided below in Finnish text, which also promotes Phantom-themed cufflinks, accompanied by images, pricing information, and a description of the available items displayed.

Translated to English, the advertisement reads:
ÄRRÄ IS NOW UNDER THE PROTECTION OF THE BLACK MASK
Order yourself a genuine 925 sterling silver Good or Bad ring. A collector’s item! Limited edition (1000 pieces per ring). Let Ärrälle know when you want to buy the ring, we will deliver it to the kiosk upon your order.
Remember dad too! Mustanaamion’s Good and Evil cufflinks will be in stores starting November 8, 2010. Limited edition (5000 pieces).
Thank you Christopher Smith for assisting with images and information.
