Hoi had a good thread on the differences between the high quality fakes and the real deal but I don't know what forum it was on. I also can't see one of my favorite tells - if the last "n" in Constellation rolls under or not because the hand is blocking it. Is that a tactical placement or just a coincidence that the seller took the photo when the hand happened to be there?
What makes my spider sense tingle is the lugs are dog leg. What's the serial number supposed to be? If it's 1962 or before that's at least a franken.
Again, let's wait for Desmond to comment before passing judgement.