The emblem in question:
http://www.destinypedia.com/images/d/d9/Sign_of_The_Founders.png
After browsing some exclusive emblem requirements, I came across this one, the Sign of the Founders. I'd seen it before, but never cared for the emblem, thinking it was some vendor emblem. Now I know that it was for playing during launch week (which I did), I look into my special requisitions and it's not there. I'll post a picture as proof and my achievements show that I played well within the first seven days.
EDIT: There is my special requisition screen.