The French Richelieu class battleship. Unorthodox design of 8 x 15" cannons forward in 2 quadruple turrets while having 9 x 6" aft - seems like it would be more effective to have another quadruple turret aft if weight permitted... The French really seemed to like the quadruple turret.
The 2nd ship of this class, the Jean Bart, engaged Allied forces at Casablanca. Still under construction and with only 1 operational turret, the Jean Bart engaged USS Massachusetts - which proved to be a mistake....although apparently quite a few of the 16" rounds that hit her did not explode due to the shell's fuses having been manufactured in 1918...
Just as the US had plans for the Montana class to follow the Iowas, the French had plans for the Alsace class to follow the Richelieu - this class did have a 3rd quadruple turret...