How to Break a Proof Set

U.S proof set in its plastic case.

U.S. proof sets are produced annually by the U.S. Mint. The individual coins that make up the sets are encased together in a sealed plastic case by the Mint. To have the coins professionally graded, and thereby increase their value, the proof sets are broken apart, and the coins placed in individual air-tight plastic holders. Breaking a proof set is really quite easy, though not recommended unless the coins are being graded by a coin service.

Things You'll Need

• Flat screwdriver
• Small saw
• X-Acto knife

Instructions

1. Remove the plastic-encased proof set from its cardboard container.

2. Wedge a small, flat screwdriver between the seams of the plastic case. If the seams aren't visible, carefully saw with a small straight blade saw or X-Acto knife.

3. Separate the plastic case halves, and remove the coins from the case.

4. Transfer the coins to airtight containers to minimize any exposure to the air. A plastic zip-top bag is sufficient for temporary storage. Alternatively, submit the set intact to one of the two recognized grading services, NGC or PCGS, for grading and slabbing (encasement) under the strictest conditions.

Tips & Warnings

• It is not the usual course of action to break apart proof sets, unless one coin in the set becomes especially valuable.

References

• ProofSets.net: Proof Sets
• NGC: The Coin Grading Process at NGC

Resources

• Kitcomm: US Proof & Mint Sets