Eterna SELLITA SW200 Mode D'emploi page 20

4. IMPORTANT ADVICE
If your watch has a bronze case, we highly recommend
to clean it regularly with a soft, humid tissue in order to
prevent verdigris. Do not use abrasive or aggressive
products. Your bronze watch is created in an alloy of
copper and tin, which within time takes on a subtle and
unique patina, directly linked to the user's wearing
habits.
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