SEGS offers the "Sovereign Series" encapsulation for your "special" coins. 

This service is offered exclusively by SEGS and permits access to a renowned specialist for incomparable evaluation of your coin.  The services of these specialists are not readily available to the public, but are provided through SEGS to assist the customer, promote education, research, and continuing support for the numismatic industry.  These specialists provide you “THE ULTIMATE COLLECTORS DREAM”, by applying their actual signature to the front of the capsule label before it is encapsulated. 

Return time will vary according to each specialist’s schedule.

“Sovereign Series Service Fee”… $35.00 per coin