Frog-mouth helm

[2] The frog-mouth analogy was drawn from the way the ocularium (the slit through which the wearer of the helm could see) resembles the open mouth of a frog.

During jousting tournaments, the helmet offered a better degree of protection from lances that would splinter after impact with the rival's body armour.

Early examples of the stechhelm were made from a single piece of metal, while later dated helmets had hinged constructions that could be disassembled.

Appearing in the 15th and 16th century in Germany, the helmet became popular for jousting due to the improved protection of the eyes it offered.

Later versions had hinges and could be opened in the front for ventilation, while also "folding" around the wearer's head to put on and "unfolding" to be removed.