Dose anyone know what they do to your coin when they test them? they said it can cause damage but what sort of damage and how much? what do they do, drill holes or scratch it?
Coins can be destructively tested at every stage of their manufacture by the mint that produces them, just like any other object that is subject to quality control.
Coins can also be subjected to non destructive testing. XRF, weighing measuring and close examination for strike quality are examples. Some coins pass, some don't. Almost all test specimens are destroyed and are recycled. Some that escape recycling and leave the mint can have significant numismatic value.
Many are the threads in this forum where coins are the subject of mint errors.
Testing is essential to arrive at the target level of quality, and to maintain it. The reputation of the mint, in part, depends on it.
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