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Thank you for your reply. So the date of manufacture of my cylinder could be July 22, 1942. I am just puzzled by the lack of dots.Looking quite commonly and used for many German ww2 aircraft and also for the medic purposes . There should be the another inscription with the date of production. Eg ... Sauerstoff Leer 217 KG Füll 150 ATÜ. 16.10.40 where the 16.10.40 is the date of making.
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the pic source: the net.