My first exposure to Redfield scopes goes back to the mid-1960's. My Dad thought that they were the best scopes, and bought a 3x9 in 1962 or 63. He bought a 2x7 for me in 1964. His cost $99 and mine $95, which was a ton of money in those days.
If I recall, the Redfield variables were one of, if not the first, to use second focal plane. That allowed the cross hairs to remain the same thickness as the power was increased. The glass was clear and the optics held zero. My Dad had a problem with his after many years. Redfield wouldn't replace it, but gave him a discount on a 2x7 Widefield. I still have that scope, but don't think its of the same quality as the originals.
I also still have my 2x7, and hunted with it until last year. It never failed me in any way. Its still crystal clear, but has a slight sepia tint in the glass. I put it on my dad's old M88 Winchester that I still plan to hunt with from time to time.