Brothers Marty and Rick Lagina and their team of treasure hunters have been digging around a Nova Scotian island for over eight years on the popular History Channel show “The Curse of Oak Island.” During this nine season run, the Lagina Brothers have been on a constant search for hidden treasure, perhaps buried on the island by Spanish pirates, the British military, or even the Knights Templar.

While the Lagina brothers and metal detection expert Gary Drayton have mostly found mud, wood, and various metal tools, they — along with an assortment of science and archaeological experts — have made a surprising amount of valuable discoveries hidden throughout the 140 acres of the supposedly cursed Oak Island.

But what exactly are these interesting finds, and what historical secrets could they reveal? Perhaps the truth lies within, as we uncover all the treasure ever found on “The Curse of Oak Island.”

Maravedí copper coin

In “The Curse of Oak Island” Season 1 finale “The Find,” while searching through a swamp, metal detection expert Steve Zazulyk ran across a coin with the number “8” engraved on it. It was later identified as a Spanish eight Maravedis copper coin, most likely from the 17th century.

In the Season 2 premiere “Once In, Forever In,” the coin was cleaned and examined, revealing that the year 1652 was engraved on the back. Further analysis of the coin also revealed that it had, in fact been lost, in the swamp for hundreds of years, and not something planted recently. All the signs pointed to this being a legitimate historical discovery, the first of many throughout the show.

Could this simple copper coin be evidence of hidden pirate wealth? It certainly seemed like the Lagina brothers were on the right track to uncover the legendary buried treasure of Oak Island.

17th century military button and a coin

In “Return to the Money Pit,” the second episode of the second season of “The Curse of Oak Island,” treasure hunter Gary Drayton discovered not two distinct treasures while metal detecting.

His first discovery was made near Oak Island’s shoreline. Drayton and his team found a 17th century button from a military officer’s outfit, though which military it might belong to is unknown. However, it could be evidence that this military was responsible for some of the buried secrets around the island.

In a nearby wooded location, Drayton and his team made their second discovery of the day. Buried in the ground was a small coin, what they assumed to be another 17th century Maravedi like the one found in the previous season’s finale. However, this coin appeared to be of a much smaller size; perhaps two Maravedis rather than eight. Though smaller, these incredible finds could still lead to a much larger treasure hidden somewhere on Oak Island.

Two 17th century Britannia coins

In “The Eight-Pointed Star,” the third episode of the second season of “The Curse of Oak Island,” treasure hunter Gary Drayton made another double discovery while metal detecting along the shoreline of Oak Island.

This time around, Drayton and his team along with the Oak Island team leader Rick Lagina found two 17th century King Charles II Britannia coins, buried beneath the rocks and pyrite scattered across the shore. One of the coins found had the year 1771 clearly printed on its surface, seemingly confirming the centuries old age of the currency.

Where did these 17th century coins come from? Could they have been dropped by hurried individuals on their way to find buried treasure? Or, perhaps more hopefully, could they have been dropped by a wealthy group out on Oak Island to bury treasure of their own? Certainly, the Oak Island team would have to investigate further.

The Knights Templar coin

In “The 90-Foot Stone,” the fifth episode of the second season of “The Curse of Oak Island,” the small coin that Gary Drayton and his team had discovered three episodes earlier in “Return to the Money Pit” was inspected. It turned out to not be a Maravedi coin at all, but instead something far more interesting.

After cleaning the coin, treasure hunter and professional diver Tony Sampson saw what appeared to be a cross design on one side. This distinctive cross could be the symbol of the Knights Templar who, in the 13th century, had instituted one of the first international banking systems. Could this be a coin used by the Knights Templar for banking purposes?

What at first appeared to be the discovery of a small Spanish Maravedi coin, could instead be a significant lead towards a vast Knights Templar fortune buried somewhere on Oak Island.