An update!
So thank you, everyone, for your help. I think it helped a lot.
The car was initially just under $13,200 on kbb.com for Excellent condition. (It could be argued it was lower, considering the lien on the title, the multiple owners over the years, and the minimal service records, as well as mismatched tires with less than half their tread life.) I say initially, because a day or so before I sold it, I got an email saying the value had gone up, and it came up a little over $13,500.
A dealer offered $9750 initially, but quickly jumped to $10,500 as we hurried out the door.
I listed it for $13,999, but dropped that to $13,699 a few days later. Then I decided I may be scaring people off with "Dealer-like" pricing, so I bumped it to $13,700. Several people texted/emailed offers of $11k.
One guy said he lived close and wanted to see the car. He said he's rusty, so he actually rode along while I drove. Then he asked if he could drive it, and I even let his wife ride along (2-seater.) He came back and said he just "wanted to get under blue book", which he said was right around what I was asking. He offered $13,500, and I accepted! It sold yesterday.
So the first and only person to see the car bought it for very close to my asking price. (Some could argue I may have been able to ask for more!) I'm happy with it - I got a year of fun out of it. (I had paid $13,900 a year ago.)