For Sale a Hasselblad HC-4 Prism finder, in excelent condition both glass and exterior, the rubber isnt perfect but it is intact (no pieces are missing)
The Price is 60 (NET)

Bit of information i could find on the item:
HC4 RIGHT ANGLE VIEWER 52086 Prism viewfinder, 90 degree sighting angle, Unreversed image magnified 3 times. Adjustable diopter correction (-5 to +5). Usable with Polaroid back but short viewing tube will not allow use with 70mm magazine.

NOTE: this is not an actual photo of the item, but it is the same model upon request i will take photos and send to whoever asks for them.