Pretty sure it's an early Giant built, Traveler. Cleaned it up for the big move out of my garage and into my son's, seeing as it's his bike. (and dare I say I have too many bikes?) It's a clean machine just a little banged up from it's travels thru time.
I'd ride it if I was tall enough. I had a 76 Traveler that I rode from Tampa to Jacksonville back in 78. The 75-77 Travelers were Panasonic but had a one piece crankset, I think so they would seem American made. That was the only thing I didn't like about it. After that, they were all Giant made bikes and should have a serial number that begins with a "G". Correction: Yours is probably an 80-82 as they don't show a 2 tone blue.