Broken and halved
Two halves of one object, kept apart until the moment they had to match.
The point of splitting something
A coin bent or snapped across, a piece of silver sheared and each half kept — the logic was simple and almost impossible to fake. When two people needed proof that a promise had been made, a split token gave it: the jagged edges either matched or they did not. No inscription, no witness, no document could be forged with quite the same assurance as a broken line that rejoined cleanly.
The practice reaches back far enough that broken tokens appear in medieval English literature as a plot device — proof of parentage, of a secret betrothal, of a contract that would otherwise have no witnesses. This literary familiarity tells us something: the custom was common enough that an audience recognised it without explanation.
Betrothal and marriage tokens were often coins because coins were already authoritative objects with an established value, and because silver bent and snapped at a controlled line more tidily than most other materials. Sixteenth and seventeenth-century English records mention "broke money" exchanged at espousals — the bent-coin variant survived in some British rural communities into the nineteenth century, with the bending sometimes done together by bride and groom as the act of commitment itself. Rings were occasionally cut in two and the halves worn until reunited, though the ring's symbolic wholeness made cutting it a gesture that carried its own drama.
The halved object also circulated in a different tradition: the tally. Medieval English merchants and the Exchequer itself kept split tally sticks — a notched piece of wood split lengthways, one half for each party — as records of debt and payment. The household and the counting-house shared the same underlying idea: split means bound.
What the token did that a spoken promise could not was persist. It sat in a pocket or a box and waited. When the separated parties were reunited — after a voyage, after a period of service, after years apart — the halves were fitted together in what amounted to a private ceremony of proof. The fit either confirmed everything or it didn't, and there was no argument about what the answer was.