The set includes flight helmet, oxygen mask. This helmet is the early version of TK-2A. It has no air hole on the surface of the helmet body.
There is a triangle mark :"ZH-1A" near the earcup, inside of the helmet. The sponge inside has perished.
You can see it in the photos. The communication wires are the same as those of TK-2A. It's a good choice for collectors who study Chinese pilot helmets. We pay special attention and time to ensure that the products are well-packaged. You can order it confidently.