Re: Any information on the value of this mandolin?
Welcome to the cafe! There are some sections of the cafe dealing with bowlback instruments like yours, but that area is strongly a minority (and perhaps a strong minority). ebay completed sales, Vintage Guitar's Price Guide, and some scattered bowlbacks offered for sale at music stores are possible references for you. I personally have no knowledge.
You live and you learn (if you're awake)
... but some folks get by just making stuff up.