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Are you sure? That would be a really, really terrible crystal. 50 ppm (0.005%) is more likely, although 20 ppm is very common. Ceramic (not crystal) resonators are more like 0.5%, but that's not what your classic kit was designed to use.
davideos wrote: Although I don't have specs for this particular one I purchased, I found that the expected accuracy (at least from one internet site's perspective) is 0.5%. Mine is actually better than that at 0.22%. So I don't think my crystal is bad. Even a more precise oscillator is going to be off and will eventually show a sign of re syncing.