Welcome Philcratch!
That has what is known as the "transition headstock". You'll see those on 1979 and possibly early 1980 models.
Honestly, I have never seen the tap switch in the position it shows in the catalog so, I wouldn't worry too much about that. As we have learned, specifications were subject to change without notice. . . lol.
The only differences I see in the LC550 and LC750 are the pickups, color and the fretboard. I can't tell if yours is rosewood or ebony. I'm also not sure of the color but I believe its either the violin color or the oak shade.
If that is indeed the oak shade finish, I would think its an LC750. If its the violin color, we'll need to examine the pickups.
Then again, color could be one of those specifications subject to change. . .