We have a metal cow bell.  It is vintage. It measures about 3 1/2" in H x about 1 1/2" across the top flat handle (x about 3/4" in L on the handle) and 4" across the widest point in the bell on the base.   It is a bit rusty all over and has a few chips on the lower metal edge of the bell.  Overall I would consider this in guardedly good condition.

Cow Bell Metal Vintage