Nice set France / Monaco. We start with a very rare n°58c from France "10c brun sur rose Cérès dentelé en paire tête bêche" postmarked G.C 2387 corresponding to Monaco (signature and Uzan and Calves certificates only 3 or 4 pieces known!). A colored area and noticeable dots on the reverse are indicated, but no other defects to report. These stamps are accompanied by the very rare n°55 b "15 c brun sur rose Cérès dentelé gros chiffres" variety error in the plate and in the color of the 10c (cancelled, centering correct, Calves and Uzan signatures) but defective, dots on the reverse at the upper and lower levels are visible as well as irregularities in the serration. Finally, we have a panel of 20 cdf copies of Monaco tax no. 12 (and 12a and 12b) "40c on 30c Prince Albert I overprinted, variety without dot after the c of centimes (box 120) and spaced numeral (box 148), mint with original gums, signed Uzan. The total value is around 20,000 euros.