If you can tell me the exact markings on the scope, I could probably give you a bit of info about coatings, etc.
If you want the best El Paso scopes, they are the "-1" series, as in K4-1 (they were the last model made here). They had steel tubes, coated lenses, often Dual-X reticles, and the nice kicker is they were MicroTrac adjustments.
Some of these were also marked "-W" as in K4-W. This means they are a widefield version with the rectangle eyepiece. They are great also though I don't think that it is possible (theoretically) to seal them up as tight against water damage.
