After reading your post, I dug up a few old redfields I have that still have their boxs. A normal 4 power has a catalog in it that says "redfield '67". This catalog doesn't say any thing about a widefield. The 1974 redfield catalog that's in a widefield box lists them but says nothing about them being "new". I know this doesn't help you much but should narrow it down between 1968-73. By the way, I'm pretty sure that the '74 isn't the oldest I have, but I'm just going on stories ( I was about 1year old at the time)
