Hasselblad auto diaphram control unit with 80mm f2.8

[kryss]

I own this unit which a colleague want's to buy from me but neither of us knows a fair price,lens is in excellent condition and has rarely been used,but as is common with these units the plastic shroud is cracked and a tiny piece missing but is fully functional.Any info would be much appreciated,checked on ebay but could only find 250mm unit for sale.Thanks