MS 60 - Mint State indicates a coin that has no wear and is uncirculated. It may have numerous bagmarks and/or be toned. MS 60 is the lowest quality of an uncirculated coin.
MS 61 - An uncirculated coin that is just slightly better than MS 60. However, no question that it is uncirculated. Whereas, some may debate over the merits of a coin being MS60 because of the excessive bagmarks, the MS61 should be more desirable.
MS 62 - This coin should be a much cleaner specimen than an MS 60, yet, just slightly better than an MS 61. There should be fewer bagmarks as the coin takes on more attractive features.
MS 63 - This is the grade that many collectors feel is the most collectible in numismatics. Prices are typically reasonable compared to higher grades and the coin should have at least an average strike and eye appeal, with minimal distracting marks.
MS 64 - This is the grade where prices in many series begin to increase dramatically. For this reason the coin will begin to show fewer marks and the strike will be the strongest yet. No primary distractions that will draw your eye. A near-gem coin with just a few tiny marks or weakness in strike to keep it from a higher grade.
MS 65 - This is the gem category. Coin should be fully struck with eye appeal. Either brilliant or toned but there should not be any unsightly marks or color that negates eye appeal. Any marks should be very minor in appearance. Prices spread out even further.
MS 66 - A coin that just jumps out at you as being nicer than an MS 65. The main devices on either side should have no more than very minor ticks and the fields should be cleaner than that of an MS 65.
MS 67 - A superior coin that has no major distractions to speak of. The fields should be near flawless with just the slightest contact on the main device. This coin should emit a look of satisfaction from the viewer. Prices increase further especially for coins with short supplies and strong demand.
MS 68 - A difficult grade to determine by most experts. When does a coin become MS 68 but is not quite MS69 or 70? A very superior coin with maybe just a minor tick on either side keeping it from perfection.
MS 69 - This is a coin that should create a gasp when viewed. There should be no imperfections to the naked eye. With a magnifying glass a minor mark or impediment may be visible.
MS 70 - A perfect coin with no imperfections seen with a magnifying glass. There should be no marks whatsoever; the coin must look like it just left the Mint. Very unusual in early coins as the mint did not have the quality they do today. Modern coins have been given this exalted grade although there is debate whether coins can be perfect.