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The right coin is a SD, notice the distance from the rim.
EXCELLENT conservation job! Black is normally terminal, it had to diminish the luster in spots...but it looks great now.
Use the menu: COIN INFOMRATION>TYPES OF DOUBLING http://www.lincolncentforum.com
Appears to be an eighth note!
Wow! Those are fantastic!
Coin - Slight mad, no way a proof. Seller - Slightly mad. :)
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So sad to hear this! I had no idea! RIP Dick, a GREAT Lincoln collector.
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The spots are due to a surface contaminant - the source is irrelevant. The chemical was organic-based, has degraded and caused the coin to tone....
Appears to be a VF-level coin, it should have no red showing. Most likely it was cleaned and retoned.
I love that! I preach it all the time when someone makes the "purity claim" (nothing more than a marketing term). That seemingly tiny bit left in...
Sometimes yes and sometimes no. There's are thousands of different metalworking operations using thousands of different types of fluid. In...
The covalently bound chlorine is not the threat to metals but it certainly is once the PVC starts to breakdown. We use various chlorinated oils in...
Too bad it appears to be corrosion rather than toning. It's still neat looking. What does the obverse look like, you're only giving us half of the...
There is no vaporization in their instrument. It is nothing like sniffers used at airports and stuff. It's simply an FTIR using Attenuated Total...
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