1850-1876, nice collection of 57 private essays organized on 3 pages, including 24 Meillet and Pichot type essays from 1850, 31 Gaiffe type essays from 1876 (including 5 blocks of 4) and 2 Joubert type essays from 1872, some unusual pieces like 3 blocks of 4 of the 1c Gaiffe in 2 colours (pink frame with grey effigy and blue frame with pink effigy, Maury 2009 price = 310€ per stamp), for specialists!