The US CD V-800 (sometimes known as "M16") was developed for Civilian usage in the late 1950's by Firestone Rubber. The mask was finalized in 1957 and issued to civilian defense workers as the M16 Civilian mask. By 1975 this mask would be deemed obsolete

Introduction[]

E51R15 with the M11 filter and the E22R1 carrier from the collection of Pentapix Collections
The Rubber facepiece included a single vinyle plastic eylense and came with an M11 canister. Early variations also came with a class B grey variant exhale valve cover
Filter[]
The filter is a 60mm thread which was also common on other masks at the time (namely the M9 and M9A1 masks).
Sizing[]
The mask came in six sizes with a special canister developed for the child's sized facepieces. The mask was fairly primitive in design, lacking a proper orinasal cup.
The Kit[]
The Full kit for this mask contained the facepiece, olive colored haversack which was made of a very rough material, filter, anti-dim cloth, and the original cardboard box.
On the haversack the words "MASK, PROTECTIVE, NONCOMBAT CD V-800" along with the size number were written as a way of identifying the mask. The haversack was very simple only using one strap and some sort of button-latch system on the side, most likely used to close the bag and lock the flap in place. The filter came in a black metal can, on the side of the can in dark ink reads the instructions to opening the filter and on top of the can, is a key that is used to open it.
The anti-dim cloth also included with the kit is very common with other WWII masks, made up of a gray metal and a gray cloth inside. In order to use the Anti-Dim cloth, one must moisten the cloth first, then rub over the lens.
source
History of the Army Protective Mask from the US Army Soldier and Biological Chemical Command