Nice example of an WW2 original S.M Co canteen.

[5del]

Perhaps the Korean war or 'nam? Only if it could speak!

[Harry Davey]

Possibly Korea, in Vietnam the U.S used the M-1961 canteen, however the WW2 metal canteens were used in a secondary role (training recruits etc) until the 1970s.

Cheers
Harry