We like pictures on this forum!! Very hard to price anything and judge any sort of interest without a picture.
What is your overall vacuum knowledge, or are you strictly contacting this forum only for this item? Every member can see that this is your first post to the site.
There's no absolute value. It's all about condition and does it function? Is it clean? Does it smell? Any strange noises? New belt, New bag, how are the agitator brushes wearing? How many scuffs, scratches, cracks, etc in hood, on base plate, inside agitator housing and of course bag compartment. Any stickers, logos, attachments, covers, buttons missing, or broken?
From there its all up to what ever someone is willing to buy it for. Price high, adjust from there. See if someone submits an offer.
Search eBay, see if anything similar appears, compare the condition of the auctioned model, and see what their asking, if no reserve price.