Every girl pulling for victory - Victory Girls United War Work Campaign - E.P" poster
The pattern
This still is filed under Demonstration ad.
Define
The product does the arguing. The viewer sees the thing work, not a slogan about the thing working.
Mechanism
Proof by performance. The claim is the action: a visible, testable result the reader can replay.
Verdict
We can show a result in seconds
Why it works
It uses a strong visual pun: a girl literally 'pulling' (rowing) for victory: to give physical weight and action to the campaign's slogan. The strong posture of the subject projects competence and capability.
Steal this when
You want to use a literal visual metaphor to make an abstract slogan or call to action feel dynamic and concrete.