I will repeat that I am not an expert on ancient seals. However, here's a link to a past discussion on the topic.

Please note that ancient cylinder seals generally were rotary-cut—this being in-process similar to drilling. Whereas most or at least many modern attempts to make copies of seals rely on wheel-cutting (using the wedged edge of a rotating wheel).

Your bead has been wheel-cut—and consequently does not accurately resemble the decorations on stone seal beads. Nevertheless, the pattern, seen rolled-out, is somewhat impressive.

You say the material is copper. However, what I see looks very much like gold. Is the color not accurate?

Jamey

http://beadcollector.net/cgi-bin/anyboard.cgi?fvp=%2Fopenforum%2F&tK=carnelian+seal+beadman&wT=1&yVz=yTz&aO=1&hIz=5000&hJz=4000&cmd=find&by=&xcfgfs=tK-wT-yVz-aO-hKz