If we use cars as an example, I think the newer cars are much higher quality than the "old quality built" cars.
My first car was a new 1967 Mustang. At 70 MPH it was really scary to drive. My new Ford Escape is much, much better in every way.
As far as saws go, I would guess that some of the newer blade designs are better than the blades of the past.
Lynn referenced a wood handled saw. This is a nice touch, but I am sure Ames is using a modern blade.
My guess is that all of the saw blades are made by a few of manufactures and purchased by the major brands for use in their products.