You should check the
Vin no's, The engine and frame no's should be the same. This is the only way to know what you have.
78/79 Specials, 79 Special 2 and 80G Special
2, Oll have a hinged seat, and metal side-covers, good way to determine the year of the frame.
78SE/79SF/80SG Specials have a disc rear brake Mag wheel
79 Special 2 has a drum rear spoke wheel
78/79 Specials Have points ignition, 80 and later went to the electronic ignition
Confused
Haven't added the 78/79 Standards yet
the 78/79 year was transitional from the Standard to Special and was the only time Standards and Specials were sold at the same time.
Here is a
Buyers Guide for the Oceania market and shows the different year/models. This is a guide only as there were differences for the US market, the US had single Disk front brake and got electronic ignition on the 80SG and later. Good reading
HERE