I've seen prints where it's just "STAR TREK: THE WRATH OF KHAN." Too, there's promotional artwork and images that did not have the "II" yet.
Wow. I have NEVER seen that before. Are there any pictures online?
More importantly: here's the thread from five years ago
and I went to see TWOK
in 70mm, where he confirms that no, there was no "II" in the title at the beginning: