Washington Quarter Price Vs Mintage

Such odd trends typically run in most coin series. It all depends on the existing population of that coin and the specific grades of the coin.

Morgan dollars are a good example. You have several Morgan dollars priced higher than others even though the others have lower mintages. Several instances where you have two different year morgans, lets just give out random dates like '85 and '86. Lets say in EF condition the '85 is $100 and the '86 is $30, but in MS condition it may flip around where the '85 is $120 and the '86 is $300. I have actually seen some morgans sell for more in circulated condition than in Unc. condition because circulated coins of that year are rarer than Unc. coins of that year.

You could make an educated guess on why this happens, but in the end trends and existing coin populations is what sets the price for the most part. If I would have to give a good guess as to why the MS-63 36-D is so much higher than a lower mintage MS-63 37-S is because it is a historical trend for people to hoard san-franscisco mint coins. The san-franscisco mint has always been somewhat obscure and overshadowed by the larger philly and denver mints. So maybe when people came accross california quarters back then they were typically saved instead of spent which results in a higher population for a MS-63 37-D which results in a lower price.

I hope that made sense.