The difference between the earlier and later sun visor is that the earlier model has two fitting points and only works in “one direction” – Up, Down or any position in between, but always parallel to the windscreen.
The later version has a single fitting point which permits the visor to be moved to the left of right to block sunlight entering via the door window permitting movement from 0 Degrees to 90 degrees to the windscreen.
Look very closely at Den’s photo and you will see the second fitting point to the left of the windscreen wiper motor.
I think there were some 3rd party accessory sun visors that were available which were in dark green or blue perspex