I do not have a way to test this chip. There are some bent pins, that look fixable. Other testable chips from this random lot test good. I have related chips also listed. Some other listings for this model Z80 seem to have incorrect info; beware.

This listing is for 1 chip, not a lot of 4

Some correct info here:

https://www.cpu-world.com/CPUs/Z80/SGS-Z8400AB1.html

This item is definitely not under any manufacturer warranty. Must be sold as is. No guaranty real or implied.