Beer steins in pewter and the process of making pewter beer steins by SKS pewter at steincenter.com..Here are SOME of the most important things to look for to help determine if a pewter stein / tankard During the years I wrote / edited 'THe Pewter Beer Stein Collector 's and Researcher 's Newsletters. . S.K.S. ZINN FIVE..On this page are listed some fairly common Modern German Pewter Marks. The page is aimed BMF Stein.ociated with Acquired by SKS/Artina SKS round about 2000. Frieling Zinn is since 2009 a trademark belonging to Artina Austria..