You are looking at a Chinese Mig 21 style flight helmet. It comes complete with headphones and oxygen mast with plugs and wire included.
It is a very nice item from a private estate collection! Don't take your chances on one of the many Chinese sellers on the internet.
Feel free to ask any questions! (some countries in South America need more time).Please request revised invoice when you are finished shopping. I will send you a combined invoice. The item "Air Force Mig-21 Fighter Pilot Aviator Aircraft Flight Helmet Tk-2A" is in sale since Thursday, December 24, 2020. This item is in the category "Collectibles\Militaria\Militaria (Date Unknown)\Air Force". The seller is "felicia567" and is located in China,shanghai. This item can be shipped worldwide.