Steve,
the value of a TSUBA or a blade does not depend on what your interest or your competences are. There are aesthetical and artistical qualities plus the state of preservation that make for the appeal to the connoisseur and/or collector. Age is of little importance if quality is not present.
We can only express a more or less educated opinion depending on the quality of the photos shown, but even then, it's not the final word unless you can see the item in hand or have a SHINSA panel look at it.
Your TSUBA has very probably nothing to do with the blade. In the SAMURAI era, the mountings were frequently exchanged following etiquette requirements, changes in taste, or even battle damage. After the SAMURAI era, often decorative parts of value were cheaply sold because many SAMURAI lost their income and needed money. So you will never know why your blade was combined with that TSUBA.
But nevertheless it may be a good idea to show your sword to several experts to get a consistent opinion or even evaluation on the basis of the actual market situation.
All the best!