A couple of photos of the prototype View-Line under construction in 1966:
It had a number of differences when compared with the production versions, the most obvious being the replacement of the chrome grilles with a dummy radiator, as used on the Mk.2 cab.
When you look carefully, though, you can see that the roof is a different shape, as are the upper front wings (with different shaped vents). The rear wings hinged out on the prototype too, for (relatively) easy access to the engine, but these were deleted on the production cab and replaced by fixed, bolt-on panels.
This was also the first use of the ‘tin’ bumper and the illuminated headboard with notches for the wiper spindles, both later fitted to Mk.2 cabs.
By way of comparison, here’s the production version:
