I'm pretty sure it was the Mark VII in '33'...I'll check again. I've seen the Mark IV ONCE in the series...it was in the starboard landing pod 'museum' in part one of the mini series...only way I recognized it was after seeing DamoclesX's model of it
The Mark VII has been used by Apollo at least once since the mini series
*****SPOILERS******
In episode 5, 'you can't go home again', Apollo begins the search for Starbuck in his Mark VII ('Make that canopy crystal clear, chief')...mind you, the search was ATMOSPHERIC. They were doing Mark I 'eyeball'...a visual grid search, close to the surface. So, there you have it, atmospheric use:-)