Pewter Tankard, Beer Mugs, Pewter Beer Stein, Pewter Tankard engraved with School Crest, Club Logo

Beer stein (/ˈstaɪn/ STYNE), or simply stein, is an English neologism for either traditional beer mugs made out of stoneware, or specifically ornamental beer mugs that are usually sold as souvenirs or collectibles. In German, the word Stein means stone and is not used to refer to a beverage container
Why use a metal Tankard? Pewter mug supporters argue that metal beer mugs keep their brew frosty for longer, as the metal tankards are better at insulating the beverage inside.
tankard is a cylindrical drinking cup with a single handle. Tankards are usually made of sterling silver, pewter, or glass. 
 
A tankard may have a hinged lid, and tankards featuring glass bottoms are also fairly common. Tankards are shaped and used similarly to beer steins. 
This lid was originally conceived entirely as a sanitary measure. During the summers of the late 1400s, hoards of little flies frequently invaded Central Europe. ... The common mug also had to be covered, and this was accomplished by adding a hinged lid with a thumb lift.

Metal tankards often come with a glass bottom. The legend is that the glass bottomed tankard was developed as a way of refusing the King's shilling, i.e. conscription into the British army or navy. The drinker could see the coin in the bottom of the glass and refuse the drink, thereby avoiding conscription. However, this is likely to be a myth, for the Navy could press by force, rendering deception unnecessary.

In a bar fight, the first punch was thrown while the recipient had the tankard raised to his mouth; another legend has it that the glass bottom was implemented so as to see the attack coming.

A further story is that the glass bottom merely allowed the drinker to judge the clarity of their drink while forgoing the expense of a fragile pint glass.[5]

 

 

Covered tankards fell out of fashion in 19th century England resulting in a number of them being converted to other roles such as jugs.

 Modern metal tankards are often engraved to commemorate some occasion. 

 

In previous centuries, the pewter used to make tankards often contained lead, which exposed the drinker to medical effects, ranging from heavy metal poisoning to gout.  Pewter is now widely lead-free.