Find water pump age?

[Russianblue]

I just bought a 2nd e53 with low miles (71k) and am intent on addressing the cooling system. However, it very well may have been done by the previous owner.

So here is my question. You know how BMW always has the little date codes on all its parts? do you know WHERE the date code typically is on the water pump? If the pump was manufactured in, say, 2012, and this is a 2005, and assuming it lasted, say, 50k miles, i think it'd be reasonable to believe that the pump on the car is fairly new. i mean, the car had a Genuine BMW air filter when I bought it, which leads me to believe that it was dealer serviced (that and the pristine condition of everything else).

it'll suck if i get the whole thing apart and figure out the water pump was manufactured a year ago, at which point the car had DOCUMENTED mileage of only 65k miles. The owner before me drove almost exactly 5k miles per year and got the car inspected within the same 2 week window for freaking 13 years according to the Carfax.