A-Corn Salve 'knocks the toe corn' trade card
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 whole card is one mnemonic: A-CORN is the brand, acorn is the die-cut shape, and corn is the ailment, so the name cannot be recalled without recalling the use. The hyphen is doing real work - it forces the reader to hear the split and get the joke instead of skimming a familiar word. Cutting the card to an object shape buys it a second life as a keepsake, which is how a trade card kept selling after the transaction ended. The colour scheme is legibility economics for chromolithography: one saturated field, one hot accent carrying the drop shadow, black for the small type, and nothing else competing.
Steal this when
Steal this when the product name can carry the benefit as a pun and the item is cheap, repeat-purchase and asked for by name at a counter. The die-cut-to-the-name trick is right whenever the physical piece will be handled and kept rather than read once.