French Chocolate Opera - Lot of 13 Opera Singers Photographs

Lof of 13 unsigned vintages "French Chocolate Opera" trade cards by Guerin-Boutron  & Grondard companies depicting famous opera singers of the late nineteenth century and early twentieth century, including Breval, Caron, Cesbron, Duse, Lasalle, Litvinne, Nuovina, Rejane, Renaud, Sanderson, Talazac, and Van Dyck.  Each one's size is 2.4 x 4 inches, in very good condition or better.

SOLD ONLY AS A LOT, NOT SOLD SEPARATELY.