For historical info I received some info from a reserve unit cannon cocker ( Artilleryman) who was the container source.... He wrote:"the tubes are 1974 dated. I will be in VA in June. Last time my unit shot in VA, the tubes were 1947 dated." ....sure enough, the lids on the PA55 fiber containers are marked " CNP 3-74". It seems our modern current day 105 H rounds are packed in vintage containers.