PCGS pedigrees some registry sets.Here is a cut/paste from there site.
A valuable pedigree. In the rare coin market a pedigree is a contributing factor in the pride of ownership and value of the coin. Coins from famous collections such as Eliasberg, Norweb, Garrett, etc., usually command a premium in the marketplace. If you participate in the PCGS Set RegistrySM program your set may qualify for the free pedigree service. The free pedigree service policy is as follows:
The set must be 100% complete.
The set must be in the top 5 in the Registry.
Sets with less than 10 coins may be pedigreed if warranted. The decision will be that of PCGS experts.
The Registry member is responsible for shipping and handling costs.
The fee for pedigrees for upgrades to your set submitted after the initial pedigree is $5 a coin ($20 a coin for coins graded MS or Proof 70.) PCGS will not pedigree duplicate coins. You must submit both the upgraded coin and the coin it will be replacing. The coin that will no longer remain in your set will be reholdered without the pedigree and returned to you along with the newly pedigreed coin. Your set must remain 100% complete and in the top five to qualify.
To confirm that your set qualifies for the free Pedigree Service, contact customer service at setregistry@collectors.com. Then mail with your coins a PCGS submission form and a printed page from the set registry that lists your set in the top five.
Please note: Pedigrees can be up to 22 characters in length. If the coin has a variety designation (i.e. Type 1, Type 2, etc.), this is included as part of the total character count. Please note on your submission form if you would like your coins sequentially numbered. PCGS no longer certifies coins with green inserts.
and I guess NGC will let you put almost anything you want on a slab. Someone was raising money for the
ANA yn program recently and sold these on e-bay.
There R rated so click link at your own risk.Image:1992 Cook Island Dollar
1992 Cook Island 1 Dollar.jpg41.03 KB