I just bought a 5C last weekend at a gun show with the same adjustable aperture. Pulled it all down last night and it now works real nice. I paid $200 for it and thought that was a real good deal. It's in good condition but it has 2 dents on the side of the mount and the adjustable scale plate for the elevation is a little scratched. I jumped on it when I found the adjustable aperture on it!! Also I'll note that it came with the wrong screws to mount the sight. Luckily I had screws at home.
I'd been looking for one for the last 3 months, and kept finding them for $250 plus shipping without the adjustable aperture. Couldn't get my hands on one fast enough, as they sell pretty quick here on the EE. If that sight is in real nice shape you won't be outta line asking $250+ shipping or more. Ph5c's are like gold to those of us that want one!! Not to mention that they are getting hard to find.
If this was a week ago I'd be PMing you and mailing you a money order faster then you can say "sold!!"