What is this???

[km12288]

Hey all!
New here. I just ran across the pictured item and can not for the life of me figure out what it is. Any help or ideas would be so greatly appreciated.

Please note the mirror effect in the pictures so what is actually printed on the can is "74/53" and a symbol that looks like "S" with a sideways "E" connected to it.

Thanks a ton!

km

Information

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[cwo4uscgret]

it is a filter for a gas mask. No idea which mask, but it sure looks like a mask filter

[emmagee1917]

Yep , for one of the side or nose mounted ones here.
gas masks - Google Search
Chris