Hi Russ,
Yes, the shiny sharp-edged beads indeed do look newer than the ones with rounded edges and a soft sheen. The scan is of two strands together - the one with the prayer-box type pendant had more of the older looking beads. The other strand had the long bead with metal caps as a sort of "focal". The metal beads that Paula said are Yemeni work are very similar to new and old worn ones said to be made in Nigeria. But the ones on these strands in the scan were generally a whiter metal than most I have seen from W. Africa.