Stylish Plant Sprayer Restoration

I have a question for you, how can I protect copper to stay shiny long-term state?
Every advice will be highly appreciated!
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Today i present you this amazing Antique Syringe for flowers.
I found this syringe in a flea market, in good working condition but very oxidized because it is copper, I changed the orings, and the gasket from inside de pump.
This syringe was used many years ago in the garden to apply flower treatments and watering, now it's just a very bright and interesting decoration object.
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Disclaimer: I am no professional. I am completely self taught and would appreciate any feedback, advice or constructive criticism and suggestions.
#restoration #antique #tool