I agree with Iron Horse.
Having grew up on a farm cow bells (in this country, not switzerland..etc.) are typically rectangluar at the opening.
That said it surely could have been used on a cow. horse or sleigh.
As far as silver, you can't find what isn't there, but there is old stuff there. BTW I like those bells, have only found a couple that were not broke, and one of those has a small piece missing. I also have the clapper to one of them.