Perry, please do not get person please!
I only write my experience, done on 16610 MBW and on 16610-Z WM9.
I show you the pictures too.
BMW: TODAY , the best 16610-Z is only from WM9.
I do not respond about other WM9 products, or other WM9 facts, only becouse I do not know them!
Take in count please, that I do not tell you that 16610-Z WM9 cheaper!
But for sure , NOW, it's the only one closer to the gen ( considering the case and case accessory building ).
Wile, I hope that on the next future that 16610-Z will be on stock from other sellers too,
so the price will drop down like happened for the vintage MBW.
And all the world became one 16610-Z lovers too!
PS: the bud thing about the WM9 16610-Z now , is that he has one 2836-2 movement, so the crounwn hight is not correct, like in all the 16610 rep. .
I hope thay will get there one 2892 too soon, so the crown exit hight will be correct and that last difference from GEN will be deleted.