Vintage 1 quart canteen (Army?).

This is a vintage 1 quart canteen (Army?). Most likely from the 1950s-60s (or earlier?). In camouflage/army green insulating pouch. Unknown if it was used in the service/action. However, its condition might suggest it was as a dent on one side (only visible with the jacket off) and a word, perhaps the owner’s name, appears on the jacket ATWAN. In a bit of research. I found the suggested origin being African-Ibo and meaning “we throw the eyes”. The cap is attached by a chain to avoid being lost and two snaps secure the canteen within its jacket (which can be removed). A clasp is on the back to secure the canteen to a belt or some other connecting/holding device.