Maybe I'm stuck on the "property" thing. Although it is recurring...
Since your "more of the same" would be ignoring it. I'd wonder how things would be different if you asked her to explain what that meant, to her...
I get that she explained it as something that came up in conversation with her accountant. Who knows how he said it, or in what context. It does sound like her "take" on it was very negative. Certainly more than a simple, "is that not ridiculous that the law still reads that a woman is a man's property".
That's up to you, of course. But if you've never asked her, I suspect her answer (if she offered one) would be... interesting, to say the least. A little digging might reveal something much more deep and relevant for her...
Maybe part of why I'm stuck on this is because of how you describe her sisters. The one that is self made and the one that is married into financial success. ie. Your W likely sees the later as the husband's "property" (therefore the disdain) whereas the former is seen as a "freeman", so to speak...
I find it interesting that your W is showing interest in listening to and trying to understand things you feel are dry and boring. Any thoughts on why she might be doing that, now?
Also, do you know if your wife has noticed you have taken off your ring? If so, what was her reaction?
I do understand why you have taken it off (your reason and meaning), although I am wondering if you are really doing it for you, or if you did it to get a reaction out of your W... Just asking...