I agree with Steve. I would probably put the number of complete sets out there as 10-12. I would be very surprised if there were as many as 20. As was mentioned, there are 3 complete sets on PSA and 1 on SGC. I know of at least three other complete sets that are combinations of the two registries. Given the rarity of many of the cards in the set, I have a hard time believing that there are more than 5 other raw or combination sets that are flying below the radar.
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