your mask is a russian officers model. the voicemeter is the first clue: only officers had the need to speak and issue orders. it has a canister charge port on the side instead of the standard hose area common to ground forces.
i will research and get back to you with the nomenclature and name. you might find the same information on www.fas.org 
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“If we should have to fight, we should be prepared to do so from the neck up instead of from the neck down.”— General James H. Doolittle, USAAF
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