CO Filter Selbstretter Bergbau Pütt, Bergmann in Nordrhein-Westfalen - Marl | eBay Kleinanzeigen
German Auer SSR 16BB "Sauerstoff-Selbstretter" or oxygen self rescuer. Nothing too special but I love the retro look of it. Sadly I don't know what it looks like under the hood because
Selbstretter 1924 | Gas Mask and Respirator Wiki | Fandom
BergbauSelbstretter AUER CO - Filter Selbstretter W65 B 3 x in Nordrhein-Westfalen - Hamm | eBay Kleinanzeigen
BERGBAU - AUER Filter Selbstretter W65 - 1969 - CO Filter - Leergehäuse EUR 3,50 - PicClick DE