I think the last one is a reconstruction of the Sutton Hoo helmet of King Rædwald of East Anglia: https://en.wikipedia.org/wiki/Sutton_Hoo_helmet

Significant differences in the construction of the Sutton Hoo and Scandinavian helmets belie significant similarities in their designs. The Scandinavian helmets that are capable of restoration were constructed more simply than the Sutton Hoo helmet. None has a face mask,[300] solid neck guard,[526] or cap made from one piece of metal,[300] and only two have distinct cheek guards.[300][527] The neck guards "seem without exception to have [been] either iron strips or protective mail curtains."[528] The helmets from Ultuna, Vendel 14 and Valsgärde 5 all used iron strips as neck protection; five strips hung from the rear of the Vendel 14[529][530] and Valsgärde 5[531] brow bands,[532][533] and though only two strips survive from the Ultuna helmet,[534][535] others would have hung alongside them.[536]