Toned 1964 Proof Set (all coins came in the same OGP)
SanctionII
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The following coins were all contained in an OGP set I purchased years ago. I was very surprised that all five coins in the set had developed attractive toning.
PF67 - In hand the obverse toning is a darker purple color. The reverse is untoned.
PF66 - In hand the obverse toning is a glossy light black color. The reverse is mostly untoned.
PF67 - In hand the obverse toning is golden with some blue by the rim. The reverse is untoned, except for some blue by the rim.
PF68 - Toned on both sides. The coin has mirrored fields and frosted devices. The obverse has blue perimeter toning that frames the golden fields and central devices.
PF66 - Toned on both sides. The toning has darkened and mellowed the original bright orange color of this cent. The obverse devices of this cent has color a little different from the color of the fields, making the devices stand out somewhat. 
Comments
Excellent, with matching toning. Rare to find in single set. Congrats.
jim
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Do you have any idea what caused the toning? Was the set toned when you purchased it, or did it tone later?
An authorized PCGS dealer, and a contributor to the Red Book.
The coins in the OGP set were toned when I acquired it.
I have no idea what caused the toning. It is interesting that the silver coins toned on the obverse, while the nickel toned on both sides.
Awesome Set, dude!
I too, have a toned '64 Set laying around somewhere? I'll post when I find it.
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--- If it should happen I die and leave this world and you want to remember me. Please only remember my opening Sig Line.Very nice set.
I did see the difference between the toning on the silver coins and the nickel. Also, the half dollar and quarter have very similar color toning, while the dime is completely different. I guess toning is strange, similar coins stored in the same place can tone differently.
An authorized PCGS dealer, and a contributor to the Red Book.
The Trueview photos of the half and quarter show toned obverses that are similar. However these photos do not show the true appearance of those coins in hand under good lighting.
The obverse of the half is an attractive purple color (not a deep purple).
The obverse of the quarter is a high gloss, light black color. I have never seen this type of toning on any proof coin. It is fascinating to me.
The only analogy I can make to the light black toning on this quarter is the amazing high quality light black paint jobs that talented persons can come up with and apply to restored automobiles.