Description
Metal gas filter with circular dots at each end, one raised with square corners. Red discolouration and circle of mica on one side. Red stones(?) behind mica sheet. 'Thursday' scratched into one side.
Metal gas filter with circular dots at each end, one raised with square corners. Red discolouration and circle of mica on one side. Red stones(?) behind mica sheet. 'Thursday' scratched into one side.
