I picked them up in a thrift store today for 1 dollar each pack.
The back says they are made in France. I assume they were probably manufactured in the 70s or 80s. it talks about the atra plus and good news disposables on the back.
Well from the research I have done it looks like this is pretty close to the spoilers as the description on the back describes the plastic coating just like the spoilers have.
I have not shaved with one yet but will update when I do.
The Atra was introduced in 1977.
The Atra Plus and the Good News Plus referenced on your blade package were introduced around 1980.
They were promoted until the Sensor was introduced in 1990.