How to Identify Permium Adsense Publishers

How can i know if a website i am browsing is a premium Adsense publisher by looking at the ads.
i know that ads without the tag "Ads By Google" are premium publishers, since only premium have the option to remove that.

Any other ways to identify them?

from AdSense http://ift.tt/1j0vXXb
via IFTTT
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