The image is signed on the lower right and left corners but I haven't been able to identify the names of the authors. The colors are so bright and perfectly detailed that I had to do some research to verify that it was a chromolithograph as it looked hand painted to me.
Considering its almost 140 years, the plate is in excellent condition. There is some foxing (mainly on the white margins) that doesn't affect the quality and beauty of the lithograph. Please look at the scanned images. Blank on the back. The colors are very bright.
Size: approx. 8" x 11.5"
Perfect for framing.
This is the actual page from the 1874 book, not a reproduction.
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See more illustrations of aquatic animals here:
About the publishing house:
"Montaner i Simon. A publishing house with a history
Editorial Montaner i Simon was one of the most important publishing houses in Catalonia and Spain during the second half of the nineteenth century and the first third of the twentieth. For 120 years it produced an extensive catalogue of high-quality publications with a wide distribution network. " (Information taken from the website of Fundació Antoni Tàpies)