I have had the same or similar model a few times, twice in Celeste and once in metallic green. As far as I know it was their basic entry level "boy racer" model from the early 70's. I've seen them come with sew-ups or 27" clinchers.
I think your bike may have been "tarted up" a bit by the previous owner, using an earlier style decal set and a Columbus tubing decal, which I've never seen come on one of these straight gauge frames. The water bottle is correct for an early 80's bike.
Anyway, they are real cute bikes with a real classic "60's" look. And yours looks very clean. With a decent leather saddle installed it should do well on ebay.