The rusted remains of a very old helmet, on display in a museum. The head band, nose guard and main bands forming a cross over the skull survive, with part of a boar crest. For more detail, visit the item's entry on the museum website: https://www.sheffieldmuseums.org.uk/whats-on/benty-grange-helmet/
A replica of the original helmet described in the alt-text to the other picture. This one is complete with extra bands, studded decoration on the bands, a cross on the nose guard and hair bristles on the boar crest.
The Benty Grange Helmet, original & reconstruction. It was found in 1848 in a late C7 barrow in Derbyshire - the first Anglo-Saxon / early English example found in the country, 91 years before the #SuttonHoo discoveries. On display in Weston Park Museum, #Sheffield. #Museums Pics my own, from 2021.