Fashion, trend, has also an impact on the value for such Tsuba. I remember, end of last century , it was very fashionable to have a Tokei style tsuba in a collection (Owari school or not) and prices might go extremely high.
You can find some at any price:
https://www.aoijapan.net/tsuba-mumei-unsigned-tokei-tsuba/
https://www.aoijapan.com/tsuba-mumei-the-clock/
Depends you taste and if the tsuba is appealing to you