With all due respect, I think the one you have is one of these.
The one on top is the so called Imperial/Colt with the Crinkled scabbard. The lower one is the same one assembled by Milpar. Milpar has its name on the cross guard.
The one I'm discussing is like this:
It's the two line Colt roll mark and it has a 90 degree back cut.
It also has a star burst peen on the pommel.
It also has the "U" shaped retainer like the two pictured above. (confirmed by the seller)
One thing I don't like about it is that the ears on the latch plate mechanism appear to be parallel to the sides of the plate. Most M7 finger levers stick out quite a bit from the sides.
It may be a copy or a fake, but it is not a common piece...at least I have never seen one.
More comments are welcome.