You must be referring to the set with a nickel that lacks an 'S' mint mark. It looks like a regular proof set except there's no 'S' on the nickel.......... Necro thread!
For years and years and years, I bought US Proof Sets just to be able to say that I had one of each set. One day, I realized that EVERYBODY has at least one of each set nd that the money I was spending for that privilege I would never get back UNLESS I happened across some generally perceived rarity such as and of the No S coins or perhaps an Accented Hair Kennedy or any number of other popular coins. Once I understood that simply "buying" proof sets didn't require any special skill or know how and that ot was a dead end street from a "numismatic investment" standpoint, I stopped my quest. However, I was as happy as a pig in mud in 2002 when the 1999 Silver Sets Sky Rocketed to ridiculous money and shpuld have rightfully sold the one I had. BUT, this was well before I realized the misdirected efforts of just buying everything. Was it a waste of time? Not really since I enjoyed it while I was doing it. I still have a subscription for Proof and Mint Sets at the US Mint on the outside chance that some "rarity" will surface where I can take advantage of a FAT Market (like the 2012 Silver Sets) but I do so with the full understanding that each set I purchase is just another Beanie Baby or Cabbage Patch Kid that'll need to be stored somewhere until I decide to either: Try to sell them or crack em open and spend them. US Mint sets of ANY KIND are a dead end street in the long run. Short term profits can be made and if anything at all, from an investment standpoint (if thats what folks are REALLY after) US Sets should be considered a STIF or Short Term Investment Fund. Thinking anything other than that is just foolish.
Ok, i have looked up that the 1971 s nickle is worth a lot in a proof state, now see i have that exact nickle in a proof set is it worth anything?
Go look up the mintages of the proof sets from 1950 on and you will quickly see how the Mint, through the years, turned them from a special item into clutter that is hard to give away.