A little practice and you should be able to get some better focus, but I see a different paint scheme on the seat cowling than my 79RS. The seat itself is a custom of some type.
Are you a rear drum or disc brake?? The T model that year was drum. The RS RT's were disc. Oak likes the 79T as the best base Airhead ever produced.
Data plate on steering head should show month and year of production, and should also identify original spec, T/RS/RT.
But the dark blue/light silver was only used on the RS that year.
Looks like a 79 RS with the fairing deleted to me.