Could you ID this thing?

Also known as concentration dial.

Thank you gentlemen.

Cheers...

And if you look closely at the "B" turret you will see a black band with numbers.   This is to indicate the bearing which the turret is firing.    The bearing band id on fore & aft turrets and along with the range clock information allows concentration of fire of the battle line.  

It's called a range clock. It's not a time piece, but a signal to the distance in thousands of yards to the target. That was pretty common up until around Pearl Harbor.

Usually there was another one pointed aft. They had a small hand (10,000 yards) and a large hand (1,000 yards).

There was also a device on board correctly called a range clock that was more closely just that, but that's a more complicated story that indicates the arrival of fire control.