Unknown PACT Respirator - Possible GM38 clone

I got this mask off of eBay on a bid and it was advertised as a NATO mask.
It turns out its most likely a PACT mask due to the filter and writing inside of the mask.
AZ or A2 is stamped on the forehead of the mask and inside is stamped 1982.
The mask appears to be a GM38 style mask covered in a canvas like material, any info on the mask would be appreciated.

Soviet SCHMS Respirator

The SCHMS supposedly was designed by the East Germans to be a more effective mask that the military GP5 variant the M41, the lenses are designed so that a sniper or a soldier needing to use optics can raise them to the mask more easily. Adopted throughout the Warsaw Pact. The mask is also referred to as the "Deaths Head" mask due to it's skeletal appearance.

Soviet PDF-D Childs Respirator

The PDF series of Respirators were designed for children who were to young to wear the GP5, it's a latex mask with straps and a hose that cannot be removed.

Soviet PBF Respirator

Soviet/Russian PBF respirator, An interesting M17 clone, it uses a different filter shape than the standard clones and is generally lighter, rather than using straps it has a hood design similar to other latex Soviet masks.
It is still used by many Eastern European police forces as a riot control mask.

Soviet PMG respirator

The PMG was developed by the Soviets to utilize a lightweight combat effective mask, similar to the Nato masks. It has a skull faced design and was used by Valve in HL2 as the basis for the Metrocop mask.

Soviet MM1 Respirator

A mask designed in the 1950s for Tank Crews, it uses two front lenses a voice diaphragm and takes a filter using the GP5 intake/outtake valve at the bottom of the mask.

Soviet/Russian GP5 Respirator

The Soviet GP5 Civilian respirator is the most common mask on the surplus market and perhaps also the most famous gas mask ever made, it's a simple latex hood with two lenses and a filter intake and outlet valve at the bottom. Chances are if you see a TV show or film using cheap gas masks, they'll use the GP5.

Soviet GP4 Respirator

The Soviet GP4 respirator was issued to civilians from the 50s to the 70s. It was later replaced by the GP5 respirator which was to become the most mass produced respirator in World history.
The GP4 has appeared in much of the Artwork for the STALKER series.
The GP4 has a hose that can not be detached from the main body of the mask, it takes a 40mm filter at the bottom of the hose.

Russian/Soviet PMK Respirator

The most modern Respirator in the Russian army, it replaced nearly all of the earlier PACT models and variants of it are still used today. This model is the first issued model and is dated 1989.
The mask is more similar to many of the modern NATO masks and features a voice box, a drinking tube, and a inner face piece.