I'm still waiting to see an actual newsletter to see more detail....but it's pretty easy to come up with multiple coins that represent bullion, quasi-numismatics, premium numismatics, and ultra-rares.
Unless a bunch of one year or mintmark come out for sale or at once...or the population data changes...declines for one kind of coin should be pretty much mirrored for others of the same type (over time). In other words, focusing on the SPECIFIC coins is a bit too specific as there might not be many liquid buys/sales to establish a true FMV or price.
I think an MS63 grade for the 1907 HR is a pretty popular combination....but why an MS64 for the 1928 ? Why not MS65, the first level of Gem Quality ? Or go down to MS63 or 62 to better approximate generic bullion ?
I appreciate all the sales data from NGC, PCGS, HA, etc...but what might be really great is an index comprising multiple Saints...or better yet, an index for generics, quasi-numismatics, premiums, etc.
JMHO.....