I am not getting as many Castelfidardo vibes as I am getting Italo American from this accordion. If one accepts that this accordion had something to do with Betty Ann McCall (which, I have to admit, the dates do not line up well with that being accurate as she was very well known for being the "Titano girl" and later did do a lot of advertising with Cordavox), the distance from St. Louis to Chicago is only a 4-hour drive.
Discussing the accordion.
It's true value is not going to come from the name on the front, but from the condition it is INSIDE. If not maintained over the years, older boxes like this are going to be in bad condition inside. I cannot tell you how many times we've all heard "it sounds great" and when we get pics from the insides, see rusted reeds, old cracked wax and curled valves and major tuning. Any 2 of these placed together is already going to cost more to fix than the full market value of these kinds of boxes if touched by a competent professional repair person.
I've seen and played on a few truly famous instruments, the accordion of Lawrence Welk or Pietro Diero, for example. Neither has great monetary value, but tons of sentimental value... for the right person.