I need help determining the value of this '81 Excella II 31' center bath. I've never owned an Airstream. This unit is currently for sale for $21k. It reportedly was in a barn most of it's life. Most everything is reportedly original - even the original ice cube trays are in factory plastic. I've looked at it myself and didn't see any rotting subfloor, didn't see any significant issues (although I wouldn't know what to look for necessarily) but the price seems steep after comparing it to other Excella's online. I offered $16k and they didn't bite at all. I'm told everything works, that the awning is original (and barely used), that the tires were recently replaced, as was the water pump.
Here are the pictures: https://1drv.ms/f/s!Ah9hvNxyulSHh0Pe8fbl0f0Zf2ut
There aren't many Airstreams that come up for sale around here, and when they do they don't usually look this good, so that is appealing.