It is well-known that the mirror of the traditional Hasselblad cameras is too short to see all the image with the lenses over 150 mm (all is OK with a 150 mm).
Since the 2000 series and the 500 ELX the mirror have been lengthen and comes with a gliding system to avoid to strike the rear part of the lens while raising. Therefore, no vignetting occurs in the viewer of these cameras and the following of the 2000 and 200 series and the 553/555 ELX.
The 503 CW have been designed with a similar device, the GMS (gliding mirror system) and the new 501 CM too.
Thus suffer from the problem the : 500 C, 500 CM, 503 CX, 503 CXI, 501 C, 500 EL, 500 ELM.
This cut-off relates only to the viewing; on the film, photographs don't keep any sign.