Have you heard of a "zebra" gun?

Thought I would share some old school with the youngsters on here. Back in the 70's it was a craze among cops in the Southwest to create "zebra" guns out of their revolvers. They would do this by making it two tone. This could involve buying a blue steel revolver and then having a nickel finish cylinder and barrel (one or both) installed. I thought of this when I was admiring my "zebra" Colt Python yesterday. Does anyone remember that practice, or has anyone run across one of these weapons?