Oh! My poor back" dran' pa" o'o ought to put on one of Carter's backache plasters" : Carter's Backache Plasters.
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
Uses a charming, humorous vignette of a child giving advice to an elder to disarm the reader and present the product as a universally known household remedy.
Steal this when
You want to use a lighthearted, slice-of-life cartoon to convey your product as the obvious, common-sense solution to a relatable problem.