Probably not grease. That is an area a lot of the wheat cents show as a little weak. Probably because of the amount of metal being moved around on the obverse forming the bottom of the bust.
Those that grade higher than MS-65 are few and far between. My statement was that there were a lot of poorer grades before they reach the MS-66 and higher. The 1954 cents were known for poor quality because of the over use of the dies.
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