No serial number usually indicates 1977 as year of production, so at least we've narrowed it down a little. I can't see any evidence of fret edge binding on your images(they're a bit small
) , but if the guitar has had a refret done you might be able to see differently since you can inspect the guitar up close.
LC models in production according to catalogs are LC-1200, 1000, 800, 750, 550, 500 and thus it cannot be a 1200, 1000 or 800 because they all had fret edge binding. 750 was an export model in 1977 and had a different headstock(and also FEB). The 500 had chrome hardware so that one is out the window too, that leaves us with the LC-550.
I think it's a very good chance that yours is an LC-550, it looks like it has a mahogany neck(which the 550 only had in 1977), no FEB, gold hardware. All corresponding to an LC-550.
As for the specifications it was mahogany body, maple top, mahogany neck, ebony fretboard, AL-V humbuckers(this might be stamped on the back of yours), gold hardware.
The cherry version is not pictured in my [japanese] catalogs but I can show you the black one:
This was my LC-550: