Overton book - 3rd vs 4th edition

A while back, I came to the realization that some Capped Bust halves listed for sale by Overton # were not matching what I was seeing in my Overton 3rd edition book as far as the Rarity ratings go. For example, some R5's were listed as R4's.
Now, the Overton 3rd is the book that always seems to be promoted as "the best" despite the fact there is a newer 4th edition and maybe an even newer one. But here's what I can't figure out - why would an older version be "better"? Is this some sort of self interest by the parties promoting outdated literature, or are the "pictures and stuff" really "better" in the 3rd edition?
Now, the Overton 3rd is the book that always seems to be promoted as "the best" despite the fact there is a newer 4th edition and maybe an even newer one. But here's what I can't figure out - why would an older version be "better"? Is this some sort of self interest by the parties promoting outdated literature, or are the "pictures and stuff" really "better" in the 3rd edition?
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Liberty: Parent of Science & Industry
In honor of the memory of Cpl. Michael E. Thompson
<< <i>I greatly prefer the third edition. >>
But why?
For the most up to date rarity ratings you need a copy of Stephen Herrman's "Auction & Mail Bid Prices Realized for Bust Half Dollars 1794-1839".
Keep in mind that over time, the rarity ratings on almost all but the rarest die marriages, will gradually decline. Many R-5's have now become R-4's. However, even a tough R-4 can bring a premium due to the rising amount of collectors drawn to the series versus the amount of coins that exist.
QN
Go to Early United States Coins - to order the New "Early United States Half Dollar Vol. 1 / 1794-1807" book or the 1st new Bust Quarter book!