To the best of my knowledge, you have a 1985 model. There may be a date code stamp somewhere on the bottom of the machine by where the belt and brush roll go (example: 6-8-86).
The way this machine looks, it was also sold as the Sanitaire SC684D.
Can I have a picture of the logo and the lines underneath it on the bag? I'm looking to make a Eureka dual purpose bag and want to iron on that logo.
Thanks.