I don't own one myself, but it appears to be a pretty close replica - one of the better ones I've seen.
Also, the seller is Katarra of Katarra Creations. They make and sell a lot of great Science Fiction replicas. I own a few things from them, including a couple sets of their Lifeclock replicas.
They may not be the real deal, but they do a very good job with their replicas! This is the first I've seen their Ankh actually! Looks pretty good, IMO.
Paul C at
http://www.logansrun.com happens to own a genuine Logan movie Ankh. I've got a screen shot of one of the movie Ankhs at
http://www.geocities.com/Area51/Dimension/5357/props.htm, although it looks more gold than silver in my pics.