Here's another oddball

It says 604-8G on the back but I didn't know the G ever had the mantaray. According to Altec the H was the first. He also says the G was the last alnico mag which is wrong, the H was the last. Also he says made in the mid 90's. I thought the H was made in the 80's. What gives with these I wonder?

Altec Lansing 604-8G Duplex Coaxial Speaker and Network | eBay