Chris's camera pages
Kodak Retina right-angle viewfinder adapter for sale
This uncommon Retina accessory allows you see through the viewfinder from above. It is compatible with the Retinas IB, IIC, IIIC, IIIS, the Retina Reflex, and the Retina Reflex S.You can see how it fits on this Retina IIIC.
Complete with leather case, for sale at NZ$75, airmail shipping to the States or Europe will cost NZ$20, somewhat less to Australia.