Kodak Ektanon Dialyte F7.7

Hello,
I just purchased a Kodak Anastigmat 152mm f7.7 in barrel from Jim's Camera. I have not received it yet but it should nicely complement the Kodak Anastigmat 203mm f7.7 mounted on a Sinar DB board.
Looking at this, it seems that the Ektanon copying lenses in f7.7 were also the same dialyte design.
These seem to be elusive...
As anybody owned one and can tell me how many blades are on the iris i.e. 18 versus 5 :-)
Just to see if I should look for one or just let it drop.

Cheers,

Luc