Wehrmacht metal-based replacement air-filter (ie. 'Filter für Heeresatmer'). The piece is executed in field-grey coloured metal and was never used. It does show some obvious storage-age and/or minimal staining. The piece shows a (period-applied) paper-based etiket attached (that provides a full explanation on its use and for which types of breathing-apparatus it can be used. The etiket also shows a stamped production-date (that reads: '22 Feb. 1944'. The entire piece came stored in its period carton-based 'cover'.