Originally posted by: kranky
Originally posted by: Sukhoi
What's the difference between the Red Book and the Black Book?
The Red Book is the generally accepted reference. The Black Book is put out by a different company and tries to compete with the Red Book. It's OK, but not as complete.
I should mention that these books come out in the summer of the year PRIOR to the year on the cover. (The 2007 Red Book has just been issued.) So prices are always outdated, but still can be used as a ballpark figure for many coins, circulated Mercury dimes included.
Also, for low-value coins you can't expect dealers to pay a percentage of the retail value listed in the Red Book. Not many people are in the market for worn Mercury dimes. So if the Red Book says the coin is worth $3, a coin dealer is going to think, "How long will I end up holding this dime before someone buys it?" and the answer will be "A long time." So they might only offer 70 cents, knowing the silver content makes it easy to sell for that. Now if you have a $100 coin that is fairly popular, the dealer might offer $70. There's not a great deal of interest in cheap coins.
If that 1916-D appears to be real, then you MUST get it authenticated by a company like PCGS or NGC. Once you do that, you'll have no trouble getting a very good offer. If you don't, the dealer is going to wonder if the coin is authentic or not, since so many 1916-D dimes are faked. And that's going to translate into a very low offer, or maybe none at all.
You can get coins authenticated by NGC or PCGS through many coin dealers. If you don't know of any, PM me with an idea where you live and I'll recommend one for you.