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The UV filters are likely not worth using, since there is no benefit from blocking UV from already UV-insensitive digital sensors (unlike film, which actually can show haze/discoloration from UV) plus likely added loss of contrast/flare from less-than-state-of-the-art coatings (to be generous).
However, if you don't have a newer/better CPL, the polarizer might still be fun to play with in a few situations. So long as you are careful to shade the lens (with a hood or your hand) from extraneous bright light to reduce flare, you should be able to get some worthwhile pictures with the CPL that you couldn't without. An outdated, off-brand filter isn't a certain death sentence for image quality. Using the old CPL a bit may be a good way to help you decide whether a polarizer is useful enough for you to be worth buying a better one.
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