It definitely is a 450SE - I base that on the apparent pictorial evidence that the pleats of the backseat reach all the way to the parcel shelf. All 450SELs had a flat panel between the parcel shelf and the rear pleats - plus the rear headrests of course.
Certainly a huge impact - luckily enough most damage was occasioned to the passenger side. Had it been the other side......God only knows.
On another model - no pictures, just a brief mention. Anyone remember four businessmen smashing up a 6.3 on a notorious downhill section between Crows Nest and Cammeray/Willoughby ? It would seem that the car got totalled as a result of a collision with a telegraph pole, at an estimated hundred miles an hour - none survived. That was, I reckon, in the late seventies, very early eighties. Regards Styria