1870 AD., Spain, provisional government, 1 Centimo, Cayón 17412.

Spain, provisional government, a Barcelona based mint, manufacturated by (assayer) Oeschger Mesdach & Co., 1870 AD., designed by Alphee Dubois, engraver Luiz Marchionni, struck with this date 1870-76,
1 Centimo (15 mm / 1,03 g), cooper(0.950), tin (0.040) and zinc (0.010), total mintage 169,890,697 ,
Obv.: UN GRAMO / 1870 // L. M. , allegory of Spain seated over the Pyrenees facing right, holding branch in her right hand and extending left, signed L. M. beneath baseline, encircled by dots; "UN GRAMO", above and 1870 below.
Rev.: MIL PIEZAS EN KILOG. / * UN CENTIMO * // OM , standing lion holding the shield of Spain, OM below all encircled by dots; "MIL PIEZAS EN KILOG·", above, "UN CENTIMO", below and 8-pointed stars at right and left.
KM 660 ; Cayón 17412 ; Calicó 27 ; Fuster/Guerra 1 .

L. FORRER, "BIOGRAPHICAL DICTIONARY OF MEDALLISTS ...":
MESDACH, LOUIS (Dutch}. One of the Directors of the important die-sinking establishments of OESCHGER, MESDACH & C later ESCHGER, GHESQUIERE & C ie , at Ter Kiele (Holland) and Biache (Pas-de-Calais, France).
At one time, this firm owned private mints in Spain, and between circ. 1865-1890, issued medals as well as various coinages in commission for foreign governments. In 1868 the artist Alphee Dubois was in their employ, and during a year's residence at Barcelona, modelled for them the Spanish bronze
coinage of the Provisional government (1868- 1 870), the dies for which were engraved by Luiz Marchionni. The 10, 5,2 and i Centimes bear on one side the monogram OM for Oescher, Mesdach & Cie (1868, 69 and 1070).