that look really old type of mask they use long all go
they sell for a good price to
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my pick type NBC mask type good and bad
Bad>>
build-in filter type to replace (bad) can't be replaced on the move! only in seal off enclose areas like a tent or seal room or even inside a tank totally seal off from outside to remove the mask to replace filter! health-wise bad!
good>>
can change
filter casters on the move outdoors, open areas for the filter auto-connection close off after the filter been remove to replace a new filter set in.
attachment there are many types of NBC warfare type masks
caster is easier to replace the filters vs filter build inside the mask need a seal off airtight area so when you remove the mask to place the new filter inside!
btw the build-in filter one has to fight to get them out and place a new one can take a lot of time. not a quick replacement filter type at all. I remember have rash and cuts on my hands getting them out, bare hand no glove on ether filter get them out!
as for your likes it but think there better ones out there too!