Evolution of the tailgate on 69-73 wagons

Hi all,
After having seen several wagons of the 69-73 generation I wonder about the tailgate: it seems that the tailgate has exactly the same shape but in 69 for example you can see an external hinge. And I don't see a handle! On my 1973 Monaco wagon the hinge is hidden and there is a handle. What I find surprising is that the shape of the tailgate is the same...
Who can say more about this change? 2 ways or 3 ways tailgate ? And when did it happen?
The attached photos are a 69 T&C and my 73...

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Author: Phil64