Gad By Signs
The Lost Tribe of Gad can be identified by signs. This could have been done without the use of a seal date.
Key Prophecies
Jacob's pronouncement over Gad:
"Gad will be attacked by a band of raiders, but he will attack them at their heels. (Genesis 49:19 NIV)
The term raider would end up as the Spanish term conquistador and is best known as the Spanish ships that raided Central and South America for what would be known as Spanish Gold.
Gad ended up with a considerable inheritance, including all of Central and South America.
Spain, Portugal, as well as their extensive colonies including Central and South America are identified here.