SDCC 2012: Marvel Booth Tour
The 6th suit is the last one of Iron Man 2 and the 7th's the last one of The Avengers, after Tony breaks the 6th one in the Helicarrier scene he goes back to Stark tower and tries that one (who wasn't tested yet or some shit like that)
True the 7th was dubbed the pod armor. I call it the casket armor
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