Weightlifters Beer Stein

This is a set ( Sm,Med,Lg ) of formed metal steins of unknown origin. I obtained them at an estate sale in a lot of pre-1900 cast iron cookware. There are no maker, foundry, or numbered marks on the items. They have the molded metal handle with screw attachment. As they are a sized set, I believe that they were a custom manufacture as a novelty item. They appear, by my evaluation, poured solid metal formed, not welded pipe, not cast iron.