Stephen, it’s good you put this topic here again.
Mahler, I didn’t know how they marked a ring at the outside; you picture shows it very well .
Here a skullring, I presume it's original ? marked inside with the German stamp for silver: 835 . Unfortunatelly cleaned by the German jewler, where I bought the ring.
Outside the ring is on the backside a Dutch curled V-stamp , which stands for foreign silver imported to Holland.
PLease see pics: