Broken Unitas 6497. Is it a dash 1 or a dash 2

The balance staff is shot on a 6497 I acquired so I can't tell if it is a 6497-1 working at 18000 A/h or a 6497-2 working at 21600 A/h or at least I think I can't. The only markings I see are unitas mark and the number 6497. Elsewhere, I can see the letters 'EJ' but thats it.