I know you're right. But I think it's important to distinguish between prestige and provenance. A coin from a prestigious sale such as Norweb or Bamford will carry a premium just for that alone, and the better the coin is, and the longer it can be linked to those sales, the better for its future. But, such sales also carry a proportion of relatively mediocre coins - break the link and suddenly those are cast adrift. However provenance is generally irrelevant to mediocre stuff, and I believe that Rob is interested in tracing back the history of important pieces? For example, how much do we know about the previous life of coins in Norweb and Bamford etc? This is an area I know nothing about, so maybe Rob could enlighten us - is there already provenance for the best coins in important sales, or not, or only some? Does the existence of provenance even for those sales add much to the value-added premium? I'd love to know.