1934-D/D "Error" Mercury Dime, Fine Details, Double Mintmark D over D Obv. features the head of Liberty, facing left. Her hair is pulled up under a winged cap, which gives the impression of the winged god Mercury. Weinman stated his winged design was ment as freedom of thought. The inscriptions include “Liberty”, “In God We Trust”, and the date. The reverse of the coin features Roman fasces with an olive branch behind. The reverse inscriptions include “United States of America”, “E Pluribus Unum”, and “One Dime” Mercury Dimes were produced from 1916 to 1945 with coins struck at the Philadelphia, Denver, and San Francisco Mints. While there are only a few dates which can be considered scarce, the popularity of the series does make it difficult to complete a full set, particularly in uncirculated condition. In circulated grades, the majority of the issues are easily obtained with the exception of the key date 1916-D, which carries a strong premium even in low grades.