Great Helm late 14th century ?

[A Senefelder]

Well as far as dating goes this " final " development of the great helmet as a piece of field armour ( it would develope further for use in jousting culminating in the big " frog mouthed " tournement helmets of the late 15th century ) are almost universally attributed to " the end of the 14th century " although in truth by the last years of the century they would have been a little dated on the field, houndskulls being " state of the art " at that time. That being said there are a few later examples like that of Sir Nicholas Hauberk ( died 1407 ) which appears to be of the " frog mouthed " jousting type, and Henry V had an early development of the more " frog mouthed " type specifically for jousting, of early 15th century manufacture, although it was not field but " sport " equipment. " Late 14th century " is safe although by the 1390's it would be as I mentioned a bit dated.