Nansen-Bilder from Stollwerck's Sammel-Album No. 2 (1899)
The pattern
This still is filed under Keepable trade card.
Define
A small card people keep (pretty, useful, or collectible) that carries the brand after the encounter.
Mechanism
Retention object. The gift is the media. Recall is paid for by usefulness or delight, not by repetition.
Verdict
We can put a physical or digital keepable in someone's pocket and they will not throw it away.
Why it works
The advertising is structural rather than stated: there is no claim, no price and no product shown, only a numbered group in an album that stays empty until more chocolate is bought, so purchase frequency is designed into the format. Sequencing the six scenes as departure, science, rescue, ordeal, homecoming and audience with the Kaiser gives the page a narrative arc, which is why it was kept and looked at instead of thrown away. The captions borrow the register of a news illustration, with exact dates and named places, so the cards read as a record of real events and the brand inherits that seriousness. The name Stollwerck lettered into the scenery is early product placement, it travels wherever the picture travels and cannot be cropped off.
Steal this when
Use this when repeat purchase matters more than a single conversion and there is a live public story you can legitimately document. Break the story into a numbered set, give people a frame that visibly has gaps in it, and put your name inside the content rather than around it.