The Crosby Garrett Roman Helmet (looks Sarmatian)
https://esmeraldamac.wordpress.com/2012/01/10/the-crosby-garret-helmet-the-one-that-got-away/
Too bad they did not include the known exixting Roman routes on the map along with the newer finds.
If the CG parade helmet was fully tin plated it would have helped keep the wearer’s head a bit cooler.