Emergency breathing apparatus in a small tin with clip fastener. There is a mouth piece through which to breath in a carbon dioxide rich environment and a nose clip to stop breathing through that channel.
This is a partner to 1987-44-1; having two preservers in the museum collection allows one to be shown opened up.
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stamping:base:"CO-FSR-275/ AT 1078/ 1088-5/ 1.78"
Dimensions:0 - Whole:W 7cm (W 2 3/4")
Dimensions:0 - Whole:W 9cm (W 3 9/16")