This chin strap is clearly listed with the Helms inventory and will come with copy for additional evidence of provenance. Inventory tag attached, from 1954-1956 and used during Jon Arnett's spectacular college career with USC which included the W. J. Voit Memorial Trophy for being the most outstanding football player on the Pacific Coast. The heavily used chin strap is marked "Riddell US Pat No 2867811" and is from the collection of the esteemed Helms Hall Sports Museum, and will come with letter of provenance/authenticity from Lelands.com.