The 1970 D Lincoln Memorial penny, also known as the circulated FG error penny, is a unique and rare coin that has gained attention among collectors and numismatists. 

The value of a circulated 1970 D Lincoln Memorial penny with the FG error varies depending on its condition. In general, these coins are worth more than their face value, with prices ranging from $1 to $5 for coins in average circulated condition. However, coins in higher grades or with better preservation can fetch significantly higher prices, sometimes reaching hundreds of dollars.