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Jon CanfieldBarry, there was a small hoard of the "Ask dad" campaign sealed cases found maybe 10 years ago or so. I believe the campaign didn't start until after 1918 (I can check my records when I get home from work) so the packs are post 1918.
Edited to add: I had a copy of my guide on my bookshelf with notes in it... "Ask Dad" was circa 1917-1922. About 10-15 years ago, there were 3 or 4 cases of 500 found. The case shown above would certainly date in that time frame; 1917-1922.