I sell my great camera Mamiya RZ PRO complete with 127mm Sekor Z, a 120 Pro magazine and a Polaroid Back 
Also included: a Mamiya Sekor C §(mm 1:4,
This lens was originally designed to be used with a Mamiya RB67. It works perfectly fine with the RZ 67.
The only difference with the Sekor Z is that the mechanical shutter is in the lens and when dealing the speed it has to be done on the lease and not on the camera itself.
Feel free to ask questions. I'd be glad to answer as much accurately as possible.

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Shipping and insurance paid for by buyer. So disreguard the shipping cost and ill get the buyer an exact quote.
I accept only Paypal