No brand, no markings - as used in the NFL and college football in the 1970s.  I believe this is a Wilson chinstrap, although it does not have any markings or the Wison brand/logo on it.   Perfect for that display helmet that you have with no chinstrap.  

This is a new chinstrap from the 1970’s.  A very early example of a high mount chinstrap.  The straps are attached to the D-rings buy sewing and not metal rivets.   Perfect for that game used or collectible helmet that you have.

WARNING: Keep your head up. Do not butt, ram, spear, or strike an opponent with any part of this helmet or faceguard. This is a violation of football rules and may cause you to suffer severe brain or neck injury, including paralysis or death and possible injury to your opponent. Contact in football may result in Concussion/Brain injury which no helmet can prevent. Symptoms include: loss of consciousness or memory, dizziness, headache, nausea, or confusion. If you have symptoms, immediately stop and report them to your coach, trainer, and parents. Do not return to a game or contact until all symptoms are gone and you receive medical clearance. Ignoring this warning may lead to another and more serious or fatal brain injury. NO HELMET SYSTEM CAN PROTECT YOU FROM SERIOUS BRAIN AND/OR NECK INJURIES INCLUDING PARALYSIS OR DEATH. TO AVOID THESE RISKS, DO NOT ENGAGE IN THE SPORT OF FOOTBALL.