I bought mine five years ago, one of the last runs from Whittaker's, and paid IIRC, $359 for it. I've since seen them going for roughly $450 NIB. That was a couple of years ago.
It would probably be best to check on Gunbroker and see what the last ones sold for, to get a more accurate guesstimate of the real price they're bringing now. Even NIB 455s are bringing $350-450 now. The last one I bought was $395, for a 455 American w/walnujt stock. A 452 should bring more than a 455. I like and have both models, but the 452 will outshoot the others by a fair margin.
