Is my iMac running Mavericks?

I am looking for Mavericks on my iMac. I have looked in Finder but I do not see it there. How can I find out if Mavericks was installed on my iMac?

If you go to the Apple logo:

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Then: click 'About This Mac'

This opens a window with four tabs. The 'overview' tab shows the current system you are running.

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Go the to the Apple menu (top left) => About this mac.

The existing versions are following :

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