This isn't the oldest 40K Model I have, but it's the oldest one I bought and painted while it was in production. Got it sometime in '97. It's had some touch ups since then, and the left arm was replaces at some point, but the base Model, backpack, and base are all original issue. I have a number of RT-era Models, but I got them all second-hand, and I really don't know which of them would be oldest.