Congratulations on your recent Electrolux acquisition, Brad! According to the 50th Jubilee decal, though, your cleaner is a Golden Jubilee which was manufactured just before the Super J from 1974 to 1975.
The two cleaners look very similar to one another but have some differences, including:
The Golden J was a 1205 model, and the Super J was a 1401 model.
The Golden J had a 600-watt motor, and the Super J had a 996-watt motor
Due to the larger motor size, the Super J's canister was a bit longer than the Golden J's.
The Super J had a silver "Super J" oval decal behind the blower port where the Golden J's 50th Jubilee decal was located.
The wordmark of the Golden J had a gold "boat-shaped" border around the Electrolux letters, while the Super J's wordmark border is black.
The Golden J was originally paired with a PN-2 (with a 50th Jubilee decal), while the first Super Js had the same power nozzle and hose most of them had PN-4s with polished aluminum hoods.(the last ones were painted gold) and gold hoses with trios of white/teal/white tracers.
The serial id prefix for the Golden Js was a Z (like the teal Model 1205s), and the prefix for the Super J was a K.
The Super J succeeded the Golden J as the standard unit and was manufactured from 1975 to 1978.
Similarities include:
The gold color which marked the Golden, or 50th, Anniversary of Electrolux USA (1924).
The ivory-colored attachments were all the same. Incidentally, the brush plate of the floor/rug tool was gold.
The optional accessories for both were the same--including color: the vaporizer, the sprayer, the shag rug tool, and the Rugwasher.
The other machines sold during both time periods were the same and were also painted gold: the Model CB commercial tank and the Model B-8 Scrubber/Polisher/Carpet Beautifier.
Your Golden J is extra special, because it belonged to your grandparents. That's awesome--enjoy!