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When was Mk. 7 Power Armour introduced?

Mk 7 armour was desgined and produced during the Horus Heresy, however it was produced so late in the war that it was only used during the siege of Terra itself. After the Heresy it soon became the most popular form of power armour and has remained the most popular for 10000 years.

I think thats MK6. IIRC then Mk7 was introduced shortly after the heresy as a breed between the cheap and durable Mk5 and the highly technological Mk6

Ok...

Power armour marks from lexicanum

http://wh40k.lexicanum.com/wiki/Power_Armour#Mark_7_.22Aquila_.28Eagle.29_Armour.22