By Bismarck.Speedyjim 2016-01-13 14:58:01
A friend of mine had the exact same thing happen to him. Didn't remember if he started a Burtgang, Liberator or a Nagi(?).
Turned out to be a Liberator, and no you can't check the progress, which is silly.
Edit: Maybe check with the NPC dude who stores vigil weapons and see if one of those 2 are missing. Chances are you wouldn't store a second vigil weapon if you've started one already. Won't absolutely confirm 100% which one you're mid-progress on, but still worth a try to perhaps jog your memory.