According to CZ, the company was ALFA, S.A., of Eibar, Spain.
And, as I checked up on that, the Spanish cast frames lasted all the way until 1982-83. That was when CZ's own investment casting facility was ready to go.
So, I'd be leery of 1980-83 marked guns. I know there's going to be some owners of these guns here on this forum that will debat me on this, and they have the right to do so if they've never had a problem with their guns before. However, CZ, through the "Legend" book, pretty much tells us the same thing. Take that for what you will.