Chris,
Welcome
!
There's not much to tell
It appears to be one of the dozens of decently but anonymously made student level piano accordions built for the burgeoning music industry of the late 1950s.
It has two sets of treble reeds ( Low and Middle) combined or isolated by the levers on the right hand side.
The left hand side probably also has a low and a middle set , actuated by manipulating the two chromed levers on the left.
Measure the distance between the outermost edges of the white keys of the keyboard: if around 19 inches, it's full adult size, if around 17" (or less), child size.
It's in excellent cosmetic condition for age
and has a carry/storage case (a plus, as many have lost theirs).
If in full working order, these "basic " instruments can be quite adequate for most amateur/ folk musicians / buskers but, being by now some 60 plus or minus years old , more than likely in need of some maintenance ( tuning, waxing, new leather valves etc) even if not ever having been played for the past 50 years.
Still, pleasant surprises can happen!
As to price, this is a no frills basic model by an anonymous maker in uncertain condition and definitely not a collectible.
So: the price amounts to what a buyer is willing to pay and you're willing to accept
If you're looking to learn to play, it would makes an excellent choice of instrument.
