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What is Meant by Slabbing a Coin?

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A coin slab - this coin has been slabbed by NGC, encapsulated in a hard plastic holder

This is a coin that has been slabbed by NGC. The hard plastic holder is called the slab.

Photo (c) Numismatic Guaranty Corporation (NGC)
Definition: Slabbing is a slang term for the process of encapsulating a coin in a permanent plastic holder, as practiced by coin grading services. See slab.
Also Known As: encapsulating
Examples:
It is a good idea to have high-grade and valuable coins slabbed.

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