I had a marine toilet come in the other day. Looked up the manufacturer & model number. The manufacturer's description listed it as being made of bronze which is pretty close to red brass.
If your drain cover is listed as Jay R. Smith ... it's probably Nickel Bronze like it says in Material Construction with the link you provided. Good stuff. Made to last a very long time.
Zinc is cheap ... it usually shows signs of pitting & corrosion after it's been in service for awhile.
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