The idea that beads might be "duplicates," implies some sort of substitute or falsification. However, zagba (also adjagba) are traditional beads in Ghana--and it is very likely that many editions of them have been made and circulated (since approximately the 1940s). I would not want to judge the probable age of these beads from a photo.

["Duplicates" is one of those words, like "original," that is often used for beads, but used incorrectly. I discourage both in many situations.]

JDA.