From my Grandfathers album, circa 1928
According to worldlicenseplates.com, that style of plate was used in 1925-26.
Once the above link opens, you can zoom in.
Looks like a 1924 with nickeled shell and headlamp rims like they were in NZ (and often in Sweden by then)
Did you hear anything from your grandfather what happened to the passengers?
Looks like only one headlight rim is nickel plated.
How about the 4th door and outside door handles?
New Zealand Fords came from Canada, and canadian Ford bodies were always accessible from both sides since they built both LH and RH drive cars.
And if this was in 1925 or 26, then this was a used car that may have lost a headlight rim after a bulb change - if it isn't turned all the way into locked position, then you'll soon have to look for a replacement glass - and perhaps a rim if you can't find the lost one or if it was mangled by traffic..
Note the fine stripe line just below the door tops