1875 Liberty Seated Quarter. Proof-66 Cameo (PCGS). Frosty and fully defined, the design elements appear to float atop deep pools of mirrored reflectivity in the fields. Essentially untoned and expertly preserved, it is difficult for us to imagine a more desirable survivor from this 700-piece Proof issue. As a rule, the Proof Liberty Seated quarters from the late 1860s and early to mid 1870s are scarcer than their later date counterparts from the 1879 to 1891 era, especially in the finest grades, as here.