Question: Staffordshire helmet was similar to which helmet found during a 1939 excavation?

Context articles: Konos (helmet)
Hard hat
Pioneer Helmet
Shorwell helmet
Guisborough Helmet
Staffordshire helmet
Canterbury helmet
Sutton Hoo helmet
George Speake
Coppergate Helmet

Konos (Greek: κῶνος : "cone, spinning top") is a conical shaped Macedonianian helmet worn in combat during the Hellenistic era.
 Its pointed shape is similar to the Pilos helmet that is placed underneath a Konos as an interior protector.
 Although close in design, a Pilos helmet has a small visor around the opening and a Konos helmet is created to have a thin brim protruding from its base and closely fits around the warrior's head.
 Bronze ear guards that hang to the jawbone were later added for further protection, also differing from the Pilos.
 Spiral characteristics from the Ionic order are engraved across the front of the helmet for design.
 The Greek crest is fixed across the ridges of the helmet as a way to demonstrate tribe recognition.
A hard hat is a type of helmet predominantly used in workplace environments such as industrial or construction sites to protect the head from injury due to falling objects, impact with other objects, debris, rain, and electric shock.
 Suspension bands inside the helmet spreads the helmet's weight and the force of any impact over the top of the head.
 A suspension also provides space of approximately 30 mm (1.2 inch) between the helmet's shell and the wearer's head, so that if an object strikes the shell, the impact is less likely to be transmitted directly to the skull.
 Some helmet shells have a mid-line reinforcement ridge to improve impact resistance.
 The rock climbing helmet fulfills a very similar role in a different context and has a very similar design.
The Pioneer Helmet (also known as Wollaston Helmet or Northamptonshire Helmet) is a 7th-century Anglo-Saxon boar-crested helm found by archaeologists from Northamptonshire Archaeology at a quarry site operated by Pioneer Aggregates.
 This helmet is very similar in its basic design to the Coppergate Helmet, although it is much larger, and was likely to have had two cheek plates (of which only one remained) and a nasal (which was bent inwards at the time of deposition to render the piece unwearable).
 A simple iron boar crest adorns the top of this helmet associating it with the Benty Grange helmet and the Guilden Morden boar from the same period, and descriptions in the poem Beowulf.
 The helmet accompanied the burial of a young male, possibly laid on a bed with a pattern welded sword, small knife, hanging bowl, three iron buckles and a copper alloy clothes hook.
The Shorwell helmet is an Anglo-Saxon spangenhelm type helmet found near Shorwell on the Isle of Wight in 2006.
 Together with those from Benty Grange, Sutton Hoo, Coppergate, Wollaston, and Staffordshire, it is one of only six known Anglo-Saxon helmets.
The Guisborough Helmet is a Roman cavalry bronze helmet found in 1864 near Guisborough in the North Riding of Yorkshire, England.
 It was originally fitted with a pair of protective cheek-pieces, which have not survived; the holes by which they were attached can be seen in front of the helmet's ear guards.
 It is lavishly decorated with engraved and embossed figures, indicating that it was probably used for displays or cavalry tournaments, though it may well have been intended to be worn in battle as well.
 The helmet was found in what appears to have been a carefully arranged deposition in a bed of gravel, distant from any known Roman sites.
 After it was recovered during road works it was donated to the British Museum in London, where it was restored and is currently on display.
The Staffordshire helmet is an Anglo-Saxon helmet discovered in 2009 as part of the Staffordshire Hoard.
 It is part of the largest discovery of contemporary gold and silver metalwork in Britain, comprising nearly 4,000 pieces.
 Following those found at Benty Grange, Sutton Hoo, Coppergate, Wollaston, and Shorwell, it is only the sixth known Anglo-Saxon helmet.
The Canterbury Helmet is an Iron Age helmet found in a field near Canterbury, Kent, England, in December 2012.
 Made of bronze, it is one of only a few helmets dating from the Iron Age to ever have been found in Britain.
 The helmet currently resides in the British Museum, and is undergoing conservation work.
 It was found by an anonymous metal detector, who found it together with an iron brooch and a pin, and it is thought to have contained a bag with cremated human remains.
The Sutton Hoo helmet is a decorated Anglo-Saxon helmet discovered during the 1939 excavation of the Sutton Hoo ship burial.
 It was buried around 625 and is widely believed to have been the helmet of King Rædwald of East Anglia, and its elaborate decoration may have given it a secondary function akin to a crown.
 The helmet is "the most iconic object" from "one of the most spectacular archaeological discoveries ever made," and one of the most important Anglo-Saxon artefacts ever found.
 Its visage features eyebrows, nose, and moustache, creating the image of a man joined by a dragon's head to become a soaring dragon with outstretched wings.
 It has become a symbol of the Dark Ages and also "of Archaeology in general."
 It was excavated as hundreds of rusted fragments, and was first displayed following an initial reconstruction in 1945–46, and then in its present form after a second reconstruction in 1970–71.
George Speake, FSA, is an English art historian and archaeologist.
 He is an Honorary Research Fellow at the Institute of Archaeology at Oxford, and "a leading authority on Anglo-Saxon animal art."
 Currently Speake is the Anglo-Saxon Art and Iconography Specialist for the Staffordshire Hoard conservation team, and is working on the reconstruction of the Staffordshire helmet.
The Coppergate Helmet (also known as the York Helmet) is an eighth-century Anglo-Saxon helmet found in York.
 It is remarkably well preserved and, together with the Benty Grange, Pioneer, Shorwell, Sutton Hoo, and Staffordshire helmets, is one of only six Anglo-Saxon helmets discovered to date.