 Since no examples have been put up for public or known private sale, it has been difficult to estimate their value.While there are no Mint records of the 1974-D aluminum cent being struck at the Denver Mint, in an interview with "Coin World", Benito Martinez, a die setter at the Denver Mint in 1974, stated he struck fewer than 12 of the experimental 1974-D Lincoln cents under the supervision of Harry Bobay, a Denver Mint production foreman.The strikes were made using regular production dies on aluminum blanks supplied from the Philadelphia Mint.