If you want to add a coin to your collection that will make people stand up and take notice, then you will make the investment to acquire a specimen from the famed Eliasberg collection. 

The year 1898 saw the Philadelphia Mint strike 735 proof Barber quarters. Of those, 180 have been graded Proof by NGC. Of those, this is the only one in PR69, with none finer.

Louis Eliasberg, financier and owner of the only complete set of U.S. coins ever assembled.

Louis Eliasberg, Sr. was a financier and numismatist who hailed from Baltimore, Maryland. His numismatic fame rests in his accumulating the sole complete collection of United States coins ever assembled, focusing on acquiring specimens in the finest possible condition. It was the most comprehensive U.S. coin collection ever created.

David Hall writes,

... prior to the 1980s, most collectors mixed proofs and circulation strikes. So the Eliasberg collection features circulation strikes for the branch mints and proofs for most of the Philadelphia Mint issues. This was how collectors built sets at the time and a collection was considered "complete" if it had one example from each date and mint, regardless of whether the examples were circulation strikes or proofs. But for his time, Louis Eliasberg truly accomplished "The Impossible Dream"... he built a complete set of United States coins.