Art Deco silver tankards usually had clean or geometrical lines. During the Art Deco era is was still possible to get tankards which fell under earlier designs, just as it is now so although a tankard may have hallmarks dating it to the Art Deco era, it may not be a true Art Deco design.
Below are some examples and price guides of silver tankards from the Art Deco era including a large tankard by Elkington & Co and a tankard by H T Lamb & Co.