"Slabbed" is the colloquial term for a coin that has been professionally graded and encapsulated in a tamper-evident plastic holder by NGC or PCGS.
The Slab
The holder ("slab") consists of:
- A sonically sealed, clear plastic case
- A label identifying the coin, grade, and certification number
- Security features to prevent tampering
Advantages of Slabbed Coins
- Guaranteed authenticity and grade
- Physical protection from handling damage
- Easy to verify via online certification lookup
- Higher resale confidence and value
Raw vs. Slabbed
"Raw" coins (not graded) can be excellent values if you have expertise. Slabbed coins carry a premium for the grading service but eliminate uncertainty. For significant purchases, slabbed coins from NGC or PCGS are strongly recommended.