The only lower grade Weaver scopes were those marked "Marksman," I believe.
There were lots of variations within a K-number, usually marked after the power, K4 60B, K4 C-3, etc. Different markings indicate an improvement of some sort, which then makes the older one "lower quality."
I think they were all made in El Paso, but maybe they had export in mind when the ones marked USA were made.
There was an aluminum body Weaver scope made in El Paso for a few years, called the Classic. It was a higher grade scope than the steel ones. It is not the same as the modern Weaver Classic series.
Bruce
