Peter, At the NYINC Convention recently, I asked a NGC Rep. what proof you had to have, to get a coin designated (slabbed) as being a specific variety, or from a specific collection (Workman, etc). He said a receipt, or collector's Ticket from a reputable Dealer or numismatist, stating the fact. An example would be a sales receipt from Colin Cooke, noting that the coin was from the "Edinburgh" collection. BTW...I think there is a additional charge for a coin being designated from a collection, or a specific variety, not known to them.(which would be a lot of varieties, in the case of GB coins!). Even with their errors on coins of Great Britain, I think NGC is our best slabber! IMHO! Ha,Ha! Bob I still feel a little bit better than TPG's