Hasselblad 42323 Black Waist Level Viewfinder (Late Version) for 500 Series
This is a nice copy of the late version waist level viewfinder for 500 series cameras. It has quick closing capabilities (you can actually close it with one hand!) and I think that it makes your overall workflow faster.
This one is in excellent condition with light wear. The magnifier has clean glass and all of the mechanical functions work well.