Rare Coins Worth $10m Found By California Couple In Biggest Ever US Treasure Haul (PICTURES, VIDEO)

WATCH: Couple Find $10m Treasure Buried In Their Garden

A couple who stumbled on a stash of old coins buried in their garden have been told they could be worth $10m.

The unnamed couple, from California, found the haul, said to be in 'mint' condition, in rusty metal cans under a tree in April.

It was made up of a total of 1,427 coins, dating from the 19th century, which were never used, experts said, and is believed to be the largest treasure find ever in the United States.

It's reported to be the biggest ever treasure find on US soil

The couple were walking their dog when they found the coins, Sky News said.

David Hall, co-founder of Professional Coin Grading Service, which authenticated the find, said: "I don't like to say once-in-a-lifetime for anything, but you don't get an opportunity to handle this kind of material, a treasure like this, ever.

The couple were walking their dog

"It's like they found the pot of gold at the end of the rainbow."

"We've seen shipwrecks in the past where thousands of gold coins were found in very high grade, but a buried treasure of this sort is unheard of," David McCarthy of currency firm Kagin's, who is advising the couple, told Reuters.

"I've never seen this face value in North America and you never see coins in the condition we have here."

The couple plan to keep some of the coins, and sell others on Amazon, with some proceeds going to charity, it was reported.

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