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Message:: [QUOTE="illini420, post: 1075835, member: 19423"]I'll give you a real life example... look at the 1909 VDB Lincoln Cent.   In just looking at the PCGS populations, there are 205 of them in MS67RD.  However, there are only 3 in MS67RB and NONE in MS67BN (less than 10 of them in MS66BN). The problem is that usually when a coin goes from RD to RB and then eventually to BN, the luster fades as well.  Even if you could prevent that somehow and ensure that the coin would regrade 67RB or 67BN, instead of 66 or 65, I'm still not sure a very low population 67RB would really be worth more than a higher population 67RD.  In my 1909 VDB example, only one 67RB has ever sold at auction and it sold when it was the ONLY example certified.  it went for $920.  The 67RD examples sell in the range from $900-$2000+ depending on the quality of the coin.  So even if you bought the cheapest 67RD out there and could make it 67RB, I don't think you'd make any money on it. In practice, I don't think PCGS or NGC would just keep the numerical part of the grade and change the color designation.  They would likely have the graders look at the coin and regrade it in its current state where I believe it is highly unlikely that a coin that has turned in color at that numerical grade level would not get bumped down a point or two.[/QUOTE]