Actually, you're both wrong.
It is silver on red.
But you are also both right.
The flag with a golden (yellow) eagle on a black background. Since 25 April 1949.
Before that, the eagle was silver.
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The black eagle on a yellow background, as seen in the coat of arms book, probably comes after the Habsburgs took over.
Before that, the eagle was in silver on a red background.
Be a little more precise in your research. Look for cross-references. Also read Wiki in other languages. Look at the difference between Wiki English and German.
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