There many antique auction houses that sell tankards, but only a couple specialty stein auction company s exist.  Antique stein auctions, prices, educational and reference materials can be found at places like Munich Steins .  Stein auction catalogs are a great resource to view historical prices and see the large variety of antique mugs that have sold over the years as well as give you a strong indication of the value of the tankards.  German beer steins are among the most collectible. Click here to know more about us at http://beersteins2015.pen.io/