Key Date Problem Coins

Really depends on the problem, the price, rareity, avaailability and on and on with all sorts of situations.
Some examples would be a 1885 Liberty Head Nickel in almost MS-66 except for a small scratch on the back, near the rim for say $100.
Or an 1894S Liberty Head Dime also in almost MS-66 grade with a dent on the edge for $1,000.
1856 Flying Eagle cent with a scratch on the reverse and accross the One Cent but for $500.
Just to many possible differences in the type of problem, the coin itself, the price, etc.
Such a poll would have to have many more subjects to make it even slightly decent.

This whole area was a problem for TPG from the start. In order to establish their original concept of "all ms65 coins are the same, and can be traded sight unseen, like stock certificates", they had to kick back any problem coins, typically called "body bags". Instead of doing what they should have done in the first place and determine whether such coins are genuine, they'd charge to tell you nothing of use.

This created a new problem. Instead of letting collectors determine grades and values, they set up a de facto sorting of coins, into "genuine, grade xyz, defect free" and "not collectable and worthless, because we don't like the looks, even though there is no question that it's genuine."

There are thousands of previously detectably cleaned or scratched svdbs that tens of thousands of collectors (as opposed to speculators) would be thrilled to own. Since when does someone else have the right to say "that's not collectable"?

Now that they realize they painted themselves into a corner (and the speculator market they hoped would send coin prices skyrocketing never developed), they went to "market grading" (this au58 coin is so nice, it should bring ms64 money, so we'll grade it ms64) and "net grading" (we think this toning, cleaning or scratches should lower the value by a grade, so the coin is au55, net xf40). Then when the market changes and such toning is held as a positive, you have an au55 in an xf40 holder that should sell for ms63 money.

All the more reason we don't need tpgs, period. Authenticators, absolutely, but grades are nothing more than something to argue about.

Based on justcarl's last comment, I could not agree more. I have bought and sold problem coins and have always sold them for more than I bought them for. Just for the record, I purchased my 09-S VDB for $800, and have had offers of $900-$1,100 for it.

BTW carl, an 1894-S Barber dime for $1,000! I wish!

Funny.
I consider a semi-key. There has been debate about this too.

The same is true of Colonials. There are some that just have problems, you just have to deal with it.
All of the known Sommer Island "Hoggy money" have corrosion issues as all specimens to my knowledge, were found on Bermuda by metal detectorists. PCGS knows that these are extremely rare so all slabbed specimens I have seen, are in problem free PCGS holders.

Ha,
If it don't fit into a Dansco, I no buy!

I know biggfredd, I don't get it either.
The Sommer Island I saw was from Heritage and was in a PCGS VG8 holder. The coin was so badly corroded, you can barely make out the details of the hog.
I have sent coins to PCGS that have had the tiniest rim ding and bam!.... problem.
This is why I use TPGs only for their holder around my coin. I can care less what they think of the coins problem(s) or grade.