Oh-Oh!
That's sparking from the Carbon brushes! Take it your friendly neighborhood KIRBY distributor and have the Armature cleaned with a Armature cleaning stone, plus new carbon brushes installed. That is if you're not up to the challenge yourself!
The Classic 1-CR replaced the Dual-Sanitronic 80 in 1969, and ushered in the new 15-inch wide Nozzle. The speed switch was the same as the Dual-Sanitronic models, later being replaced from the 2-tab dual-speed switch to the single-arm dual-speed switch on the Classic Omega. You got a STEAL at $20, I payed $30 for mine from a Flea-Market friend, but it did come with a box of attachments, the BEAUTIFULLY supple hose, and the machine itself! Nixon-Era dirt isn't all that bad, Imagine what Charles Lester (Electrolux-137 is his current vacuumland username, I believe) had to deal with when the bag of his Ohio Tuec upright popped off during it's photo-shoot, spewing COOLIDGE-Era dirt everywhere!
Have fun with the new addition, Fellow Floridian Kirby man!
-Alex.