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.

Czech CM4 Respirator

Czechoslovakian CM4 Respirator from the late cold war (Mask stamped 1984).
It uses a 40mm filter thread and has a decent voice diaphragm and exhale valve, it also has triangular lenses. It seems like it was introduced to replace the M10m or the Model Z respirator as it's a more modern design compared to the other two.
The mask visually looks like the West German M65 and also came in a bag with German writing on it.

Bulgarian PDE1

Bulgarian PDE1 Respirator. Another Warsaw Pact clone of the US M17 respirator. This one is probably the closest in design to the original M17.
Used by Bulgaria during the Cold War.

Warsaw PACT Chemical Hood

Warsaw PACT version of the M17 chemical hood, it fit's better on the PACT masks than the official M17 hood. The hood is East German and is fitted on the M10m Respirator.

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 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.

Polish MP4 Respirator

Polish MP4 Respirator nicknamed the "Bulldog".
It's a basic clone of the US M17 mask similar to other Warsaw PACT clones such as the OM10, M10M and the PDE-1 respirators. The most interesting variant of the M17 clones was the PBF mask which took circular internal filters and was smaller than the other clones.

Czech Model Z/Polish MC1 Respirator

The Czech Model Z and Polish MC1 are identical masks. I'm unsure which I own but I think it may be the Polish model, it's quite similar to the French M51 in design.
It takes 40mm filters.