1845 - 1848.
Very good condition as shown.
Somewhat more that 303 Imperial sets were printed.
These lithographs were printed on paper sized at 22 x 28 inches, termed the imperial size, and also defined as the elephant size.
Besides the size, these prints are identified by the legend at the lower right "Lith. Printed & Cold. by J.T. Bowen, Phila."
