I was doing some reading and it looks like I lucked out, my insert which I thought was an mk1 because that's what the seller listed it as, is actually pre mk inserts. Whoever decided to name them mk1-2-3 left this one out. This guy calls it mk0.5
http://rolex.watchprosite.com/show-forumpost/fi-732/pi-5769208/ti-849983/
I think it's even earlier and rarer than the mk1 that I thought it was, maybe the first insert made for a very limited time right after the red triangle ones. I don't think I'm going to use it knowing just how valuable it might be.. Kind of a shame but I don't want to risk damaging it!
Top is mine, middle is known mk1 and bottom is the "mk0.5" from the link I posted which compares to mine the best imo