OP, unless there's something wrong with it, you appear to be priced too low for a 2016.
Conversely, for those of you who are potentially interested, be careful. This is a single-post author with apparently no track record on this forum. I am sensitive to the issue of potential Airstream Interstate scams after someone tried to scam-sale ours
For comparison, here is a pair of 2016s listed on Airstream Classifieds right now. We are in a seller's market because of the pandemic, with rigs like these often fetching their original purchase prices.