Nothing. There is only 1 thing that changes a coin from being MS to not being MS. That 1 thing is wear. It doesn't matter where you got a coin from, it can be from a roll, it can be from a bag, it can be from the mint, it can be from the bank, it can be from your neighbor, it can be from the grocery store. But as long as the coin has no wear then the coin is MS. If the coin has wear then the coin is not MS, not matter where or how you got it.
Right - that was what I was saying On Top of Spaghetti On top of spaghetti, All covered with cheese, I lost my poor meatball, When somebody sneezed. It rolled off the table, And on to the floor, And then my poor meatball, Rolled out of the door. It rolled in the garden, And under a bush, And then my poor meatball, Was nothing but mush. The mush was as tasty As tasty could be, And then the next summer, It grew into a tree. The tree was all covered, All covered with moss, And on it grew meatballs, And tomato sauce. So if you eat spaghetti, All covered with cheese, Hold on to your meatball, Whenever you sneeze.
Yeah, but you know why I don't subscribe ? Because anybody can claim that any light wear, even wear from circulation, is cabinet or roll friction and then use that as an excuse to grade the coin as MS when it simply is not. PCGS states that any coin with light wear can be graded as high as MS67. But they supposedly will not grade any coin with light wear MS68 or above. Well, what happened to that wear ? Did it magically change ? No, it didn't change at all. It still came from the very same cause. If it is reason to prevent a coin from being graded 68 or higher then it is reason to prevent the coin from being graded MS anything. The theory and practice exists for one reason only, so collectors can claim that they own MS coins that are not MS at all. It is PCGS's way of throwing a bone to collectors so they can feel better about themselves and their AU coins. That's the problem with the theory. With very, very, few coins can it ever be known for certain or proven that the light wear on the coin came from cabinet friction. And that is where the theory originated to begin with. From specific coins that were documented and known to have been purchased directly from the mint by a specific person and then stored by that person in his coin cabinet. Usually for very long time. But wear is wear, no matter how it got there. And if a coin has wear then it is not mint state. That theory is like saying that somebody is only a little bit pregnant. Nobody with any common sense should subscribe to that theory.
As Ruben already stated, it is treated as an abrasion, not wear. It makes perfect sense that roll friction could limit the grade of a coin at high mint state grades yet not be treated as wear. This is 100% untrue. The reason they do it is because they market grade coins and the difference between a high grade mint state coin with roll friction and an actual AU is coin is obvious. The TPG's and everyone else recognize that these coins are not equal and should not be valued the same. I am okay with some circulated coins ending up in MS holders in order to ensure that great coins with roll friction are market graded accurately. To be clear, it is your opinion that wear is wear, no matter how it got there. Your opinion is not what is accepted by the numismatic society and to say that anybody who disagrees with you lacks common sense is arrogant to say the least. BTW, what grade would you assign this Saint?
The funny/ironic/confusing thing is: the commemorative coin you use as an example for a MS coin actually received some degree of special care and attention like that of a proof coin. A better example would have been coinage intended for circulation, regardless of it's condition. The MS and PF designation in the Redbook delineates most times just between proof coinage, and then leaves everything else. Whether it's a clad quarter intended for circulation or a commemorative silver dollar with an uncirculated finish, they are both lumped into this MS category. Ultimately, I think "business-strike" would be an appropriate term to use in relation to the OP.
Gold and other coins should grade according to grading system, I think gold coins aren't exceptional ones that have different grading system. From what I see, it's nice coin, but it has marks on high points. That's why I guess it's AU 55 to 58.
If the marks you see are bag marks, or contact marks from other coins, those usually don't hold a coin back from an MS grade. Circulation wear does; however.
If a coin has been taken from circulation it could be uncirc or circ, if a coin has always been in a roll, bag, mint set, since minting, it is uncirculated. Ms-60 can have bag marks and stuff
I assume knee is high point for that gold coin. You can see it's knee and leg with wear marks instead of contact or bag marks.
I can't be 100 percent sure until I have that gold in my hand and examine with magnify. It's my estimate based on picture it provided.