Language: Mandarin Chinese
Source: In common use
Kuī (盔) means "helmet" in Chinese.
A Jianruiying field helmet.
At first glance this looks like a standard pattern Qing military helmet of the late 18th century. But: The back and side flaps are indigo blue with yellow edging: Jianruiying colors.
A practical helmet, the flaps are brigandine with rectangular steel plates are secured inside the fabric with rivets that can be seen from the outside.
Jianruiying helmet. Frontal view.
Jianruiying helmet. Back and side views.
View inside the helmet, showing the liner cap.
Liner cap in Jianruiying colors.
(Usually, these are black and red, regardless of banner affiliation.)
Jianruiying helmet, top view.