Yea but...
Hey, this is kinda fun!
OK, the indent in the tail panel says post '69. I don't see a split in the front bumper, but maybe my eyes are deceiving me. The black bumpers are GT/J, which is post '69, but the windows still have the chrome trip, so that says GT/L, so the bumbers were probably painted. I think I see the heater valve inside the engine compartment (post '69), which MAY have been changed as per the Factory Service Memo, but...
As Walter says, the square dash indicators say pre-'71. So does the push button on the indicator stalk for the high beam dimmer. As does the ash tray. And the lack of the rear console. I think the window cranks are in the correct place for the early model. I can't make out the seat belt shoulder mounts, but low mount says early model.
My guess would be that it's a '69 or even a '70. Maybe the registration date is somehow incorrect? Only way to REALLY tell is to look at the back of the gauges to see if they still have their build date sticker. And in any event, the "official" '68's were all prototypes, so by November '68 they are '69's. Hey, didn't '68's have some weird VIN number, in the same line as the Kadett in '68? As in they started with a "92" like the Kadett Rallye?