Your descriptions are rather vague, and we have no pictures of them, so a vague answer is all I can give. "beat up" knives from the 1970's on generally have value as users, which was what they were made for. Depending on your definition of "beat up", they might be worth three to ten dollars, but really have no collector value, unless they can be scavenged for parts to repair another knife, such as a unused blade or shield to replace a missing or damaged one on a knife with some value.
Used knives (not beat up) are worth just a tad more. Occasionally, if it is an uncommon pattern, a collector might be interested in one as a "filler" knife to fill a blank spot in his collection until a mint one can be obtained. In this case, the knife might bring half of it's original price, say... ten to twentyfive or more depending on the pattern.
To be worth the most, a knife has to be (A) Pristine (B) complete with box and brochures (C) uncommon (or at least thought to be) (D) in demand.
None of this is hard and fast rule, as I have seen common, less than pristine knives become the object of someone's fancy, and bring far beyond what I personally consider to be their fair market value, and I have seen rare pristine, complete knives fetch prices far below their value (these are my personal favorites).
A knife produced for only a couple of years will often bring in used but excellent condition what a high production mint knife will bring.
Post some pictures and accurate descriptions and we will try to be more helpful. Or just enjoy using your Schrades as was intended. They made very few low quality knives, particularly in the Old Timer and Uncle Henry series.
Codger
