Nudge --- never "no marking"? Old LACA newsletters show a few with no names at all and a few have turned up clearly Lefever with other non-Lefever or partner names (J. Pretchel??)
Now as to who made it? When I saw it hit Guns International a few years ago I pined over it as a Lefever -- I don't see that anymore and say all Parker. But hey, that's just my 2 cents.