Hello everybody! Please help me with this marks on golden ring, found in Estonia. PB - ? AP56 - this must be 56 zolnicks, assayer Alexander Romanov, i think? Is PB assayer Rudolf Würst? Thank you and best regards! Meelis http://2vtabq.sn2.livefilestore.com/y1pwBxCjdNB4Ijxc8bDCbDxEJSetmqdNPmphytIpbg...