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Most rubber masks are made from latex rubber. It has the same enemies as plastic & paper. Keep it away from heat/sunlight, moisture and oil. I've had some masks for over 25 years that look great, and some dry up and crack. I've made some that last, and others rot. There's alot of variables, mostly with the chemicals in the latex and or setting temperature.
The best way to clean it is with a damp washcloth, don't put it away wet, or with body oils on it. Dust the inside lightly with baby powder and stuff it with some clean, plain paper like they use for packing so it keeps its shape.
As for value, I have no idea. Look for some manufacturer markings. One of the top makers is Don Post, their stuff usually holds ther value.
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