My condolences on your loss.
The accordion is certainly beautiful on the outside. As some have already stated, however, there may be some serious problems on the inside. Although it's true that storage of an accordion in its case for seventy years almost always results in some internal deterioration, that may also depend on the conditions in which the case was stored. If it was stored in an attic or basement, the chances of damage are increased. If, however, the case was stored in a relatively climate-controlled atmosphere (the main or second story in a house - even in a closet) it would still probably need re-waxing and tuning.
The choice is yours. If you want to display the accordion and not play it, you'd still have a beautiful instrument to display. On the other hand, if you want it to be played, either by you or someone else you know, please bear in mind that only a qualified repair technician can tell you about its value both before and after restoration. Be prepared to spend more than either of those dollar amounts for any needed service.
I am in the New York area, and I'm aware of three qualified technicians, two of which I have had personal experience (both positive.) I don't really know anyone in your area, but if you don't hear from somebody on this forum about evaluation and/or repair, you might try the accordion repair group on Facebook and a similar group at Yahoo. Of course, of you aren't already registered at those two groups, you'll have to complete a registration process. As you've done here, posting pictures can help.
Good luck!
Alan