Warren,
Actually it is "not" a fluted hilt. It is a "RDH" (reduced brass hilt) and an "SC" (scalloped brass collar). Both of these options are still available, although fairly unusual and not many were done on a #4-4 1/2" (or is it a #4-5"?). It is a way-cool knife, but can be duplicated. Don't worry, Burnie. You need to know this can be done, because I don't foresee Warren cuttin' loose of it anytime soon!
Best, Capt. Chris