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Beach bun

I found this object on a beach in northern Tasmania...
Beach bun

I found this object on a beach in northern Tasmania (see photo). It weighs 60 grams, is very hard to the touch and it stinks. Somebody suggested to me, because of the evil smell, that it might be ambergris. Is it ambergris? And if not, what could it be?

Christina Bernhard, Launceston, Tasmania, Australia

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