1971-D Lincoln Memorial Cent.doubling?

Well keep in mind that they sell coins. Sometimes they don't see what we see on them that makes they year varieties. What is a year variety? Some years have large/small dates. Some of these are 50/50 so they are different but they don't have an extra premium for them. IE:
Cents:
1960-D has large and small date coins, but as mentioned the Denver ones were half and half, so no premium for these:
1960 plain small dates have a premium on them. So if they are BU, you might check to see if they are inflated in price or not? How can your tell the difference between the large and small dates? On the small dates look for the mark on the inside of the '6':

Also check the proof cents for the small dates to see if the price is different between the two? (Some shops may not notice the differences, some do.

There are other different reverses on cent that are interesting to look for on their 2X2 coin stock.
1988 and 1988-D cents with the RDV-006.

Tough to see on an eye piece the differences, but a clue to find them a lot easier?

Note the AME areas on these devices. Not the common ones are the rounded examples that year. So look for the flat larger devices on the RDV-006 dies. That is a lot easier to see with a glass. (This is a year variety as the RDV-006 was not to be used until 1989) So if you need a quick reference as to what the RDV-006 looks like? Look to match it with a 1989 Cent on that area.

1998-S and 1999-S proof sets. Look for the Close AM on the proof sets. What does the differences look like?

They are supposed to be Wide AM's on these years, but some of the dies were hubbed with the wrong reverse with the Close AM. (1993 cents are all Close AM's which is normal that year, so don't buy these. But the Close AM's on the proofs on the 1998-S and 1999-S proof cents are the ones to search for. (Chances are slim, but a premium coin when found)

Quarters:
1956-1964 Philly reverses on the business strike coins. They used some proof reverses on those years that are called a type 'B' reverse. What does that look like?

Note the differences on a proof quarter and a normal type 'A' quarter. The first clue is the space between the 'ES' on States:

These are year varieties. Easy to spot when searching dealer stock when you know what to look for. They often miss these are they don't under stand why they will be out there. I was asked after I purchased one, and I told him the differences.

Well these will keep you busy looking for a time. But guess what. The images will be on your phone as a reference by looking this thread up again while your in the shop. Just a little bonus today to search for in the coin shops. A lot more, but you don't want to be evicted if you spend too long in there. LOL

CoopHome: What are year varieties? How they can be searched for in a local shop?