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They made millions of them. If you keep your eyes peeled on the bay you can probably find one that is in perfect shape. This one from circa 1947or 1948 .........

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Sounds to me like you're talking about the bar guard ? The part that would be just under the blade edge running along your face ? Some call it a 'closed comb'. It is plated brass so AFAIK there is...

The rust would be from someone leaving a blade in it and the rust on the blade staining the DE. The super speeds are plated brass. Maybe a bit of semichrome, flitz or mass. Gold plated ones Windex or...