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I looked in the 67 assembly manual and it says that is used for power tailgate window power, power windows, and something else, I will post a pict from the assembly manual later. So not all have it.
On my 67, it is an auto-reset circuit breaker that is for the power convertible top. Like mentioned above though, it can be used for most any high amperage accessory.
Thanks, after I look back at the different cars/station wagon I see this now. I took my C/S apart over 10 years ago and didn’t have that in my pile of wires, now I know why.