By no means am I an expert.
I was looking for a minuet for a couple years and just got mine.
What I saw was a range from $3k to $8K.
Looking at your pictures, everything looks original, if everything works, What i saw it would be in the $6k range. minus $500 for a furnace.
I used the classifieds here on the forums as well as Vintage Airstream Classifieds | New & Used Airstream Trailers For Sale
When you say you just came into possession, I hope you are planing on using and enjoying it rather than just making a quick buck.
But if you are planning on selling it, price it fair, be totally honest, and list it here on the forums classifieds.