I have one Mamiya 28mm "D" lens for sale.
I purchased it in 2009 with my P45+ from Phase One. I rarely used it (probably I can count how many times) as Mamiya 75-150mm "D" stays on my 645 AFD II for 90% of the time.
The price of 28mm is $3990 or BO. Lens is in Mint condition.
Thanks for looking.