I checked out the owners manual of the GS 1100GL. The picture they show does not look like the bike I had. The engine is not right as it has the round covers over the cams, mine had rectangular. My mike was not 2 tone. It was all black. The side panel did not have a different color centered, it was all black. The seat looks right. It does say GS 1100 L but mine did not have the GS. Biggest difference I see in the pictures of the Owners Manual is that bike is shaft drive, mine was definitely chain driven.
Agree, I always thought it was the Japanese attempt at a low rider. It was very comfortable ride but the 4 cyl buzzing at cruising speed put my hands to sleep in about 50 miles. The guy who bought it was adamant that it must be documented a 1979. Maybe he knew something I didn't know about the bike. I do recall him saying it was the only year for this particular bike. But I never found out what that meant.The confusion was caused by Suzuki by their model roll out dates. There were a lot of half year models that were sold as new models so a half year model could be a '79 or '80 depending. The bikes changed very little from '78 into the '80's mostly paint colors available, some seat styles,carburetors, etc. The main change was going from VM carburetors to CV in '80. You had an L model with a stepped seat, leading front axle and buck horn handlebars. The Japanese were big fans of Easy Rider and wanted a chopper style bike.