This is a water pump for for some of the Cadillac V8's made in the early 1930's.
It says V-16 on it, but it is probably for the V8.
Appears to be a rebuilt unit that has been sitting on a shelf for many years.
Moves freely, but there is pulsating when moved. So it probably needs to be rebuilt again.
I didn't know you need to grease the nipple of your water pump. Adds a whole new dimension to oil, lube & filter!