Well, If we go way back to when the Jew's were scattering to avoid persecution. The Spanish were the first to let them in their country. however. They put a "mark' on them to distinguish that they were not Spanish.
Would'nt that constitute a "mark"?
Good day, 1christian1!
To answer your question, we have to apply the clues that the scripture gives us.
"He also forced all people, great and small, rich and poor, free and slave, to receive a mark on their right hands or on their foreheads, so that , which is the name of the beast or the number of his name." - Rev.13:16-17
all people, great and small, rich and poor, free and slave, would refer to all people from all nations, people, tribes and language. Therefore, it is not restricted to the Jew's.
"To receive a mark on their right hands or on their foreheads"
The mark will go on either the right hand or the forehead
"They could not buy or sell unless they had the mark"
The mark therefore will be necessary for people to be able to buy and sell. Putting that into perspective for today, buying and selling is electronic crediting and debiting of ones bank account. Today, people go to the grocery store, get their groceries and swipe their cards to pay for their items, which electronically debits their account in real time (buying and selling). Then on the way home, the stop at the service station to fill up their vehicle, again swiping their card which debits their account in real time. Then they don't feel like fixing dinner, so they stop at El Polo Loco and buy some chicken dinners and once again swipe their cards which debits their bank account for the total cost. Now, we have people being chipped so that they can make these same purchases with the scan of their hands. This is the mark of the beast technology which will continue to evolve in preparation for that coming antichrist/beast.