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The item, dubbed the Rudham Dirk, was examined by Norfolk's Portable Antiquities Scheme and found to be of "incredible importance."
The British Museum said similar daggers discovered in Europe include one in Oxborough, England; two in France; and two in the Netherlands.
Tim Pestell, senior curator of archaeology at Norwich Castle, said the discovery sheds some light on Middle Bronze Age history.
"We are delighted to have secured such an important and rare find as this, which provides us with insights into the beliefs and contacts of people at the dawn of metalworking," he said.
The $65,000 price tag for the dagger was paid in part by a $61,500 grant from the National Heritage Memorial Fund.