Most 1927-S Lincoln Cents that you will see were struck from well worn and even terminal dies so weak strike on this date is actually the norm. When you encounter a better struck coin usually the better strike is just on one side. Here's a coin that has a sharp strike on BOTH SIDES of the coin. Grab this one while you can. This is well worth the premium to what an typically struck 27-S in AU commands in value. Remember that a sharply struck 27-S in Mint State can easily command five hundred dollars and well north of that if MS-64.