Interior height 10' NCO

[kimosawboy]

I have an older (1970?? been re-skinned with Al, so no dates/cards) NCO that I'm trying to find the interior height. I have seen 6'4" but that was in reference to newer models. Does anyone know if that has been the same height all along??
Thanks
G Vavra

 

[PackRat]

My '76 seems to have the same interior height. I am 6'4" so that's how I know!