That is a good point.

In general terms most of the time periods or era's that we refer to when describing beads are region specific. The migration period if it can be clearly defined is also regional, because practically speaking it only covers parts of Europe and Western Asia. The Roman era, even though it was quite large only covered the area of Roman influence, or trade. With the Roman or maybe even the Islamic period, we allow it to generally refer to a time period. For example a bead may have been made somewhere during the "Roman period", even though it was not necessarily Roman.

The so-called "Age of Exploration", or the Venetian/European glassmaking period was probably the only era that was world wide or at least covered the largest part of the earth. The most abused period by bead sellers and collectors is probably the Phoenecian trading era.

Nevertheless,I also agree that they are great beads Hendrik, and often very difficult to find, especially in good condition, congratulations.

Jan Skipper