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World Coin Association / MDM Group
Bloherfelder Strasse 25
26129 Oldenburg
Germany
Email: johann.heeren@world-coin.org
Phone: +49 441 408 6844
MDM Münzhandelsgesellschaft mbH & Co. KG
Theodor-Heuss-Strasse 7 38097 Braunschweig
Email: info.wca@mdm.de
Phone: +49 531 205 1901
