Quote:
Good points cladking. However, you cannot rely on mint sets at all. I've been though many of them and they have their share of problems with strike, spotting, etc. too.
Indeed!
Mint sets are not the answer to every question concerning moderns as some seem to believe. There are some coins that simply don't come nice in the mint sets and you'll just have to try to find rolls. And, of course, there are a lot of issues that don't appear in the sets at all.
The mint set coins are more carefully made from new dies but they often get mangled before they get into the sets. Some of the quality in these sets is just simply abysmal. The very worst is probably the '76 type I. These are just covered in planchet scratches under a layer of gouges and scrapes and more scratches.
But for the main part finding gems in the mint sets is like shooting fish in a barrel. Even coins that come horrible can usually be in gem with persistence. All of the cents except the '82 and '83 issues made since 1965 can be found as superb gems in the sets though some are very tough and some are tough even in typical gem or near-gem. Dates like the '79-D or '84-D are very very elusive. The '72-S can be almost impossible too if you want a really sharp strike.
Even ten or twenty years ago there was a growing problem with corrosion on the mint set coins. It certainly hasn't improved but there are still many coins that are pristine.
Time don't fly, it bounds and leaps.