I'm going to have to take the BB off my mid-80s Sannino and check those tubes again (when I get to it, ya sure!). When I first got it, I did fish around in the downtube and seat tube at the BB shell and I thought I felt the rifling on both tubes. There was no decals on the frame. Then I found a site with old catalogs from about the era and they all stated it was SL.

Not a big deal except for my personal interest, especially if the tubes don't seem to be what's listed in the old catalogs