My great-grandfather served in WW1 but at the very end (induction in early 1918). At some point between his induction and his death he was given this poster. There is only his name, induction date, where he was inducted and his branch information. Looking on the front I don't see any information about who created the document so there's no real hope there.
Obviously in 1918/1919 the war wasn't called a World War and the typical name was The Great War, but I don't know if this term came into use before WW2 although it seems that it would have since it doesn't describe it as a first World War, just "World War".
What do you guys know about it?
This is a commemorative print by the artist Dan Smith titled ‘World War - In the Service of the Nation’. You can see his signature in the centre on the right hand side. It was published in 1919.
As far as I can tell, this appears to be a certificate of service for WW1 veterans. Since it contains his induction information, I’d say it was given by the Army, though I can’t be 100% sure.
There is a print of this in the Library of Congress. You can find more information there: https://www.loc.gov/item/2002719506/