Lesinutah
Les,
Your eyes are likely deceiving you; the Tradition never had the lettering on the bag cap but, of course, you're correct the Classic III's bag cap did. The bag cap for the Tradition didn't need that because it said "Kirby Tradition" on the handle fork label.
There was, however, one Tradition version that did have lettering on the bag cap: the Golden Trophy model, which said "Kirby - Golden Trophy" in, of course, gold lettering.
My Tradition did have the headlight lock before, but the cap lock button mechanism is totally gone. That cap lock assembly also meant the original speed switch was inside the cap, before the conversion to the one on the fan case.
~Ben