I am looking at it right now. i see no seams, or anything. It is quite heavy, and on the bottom where it is grounded out, there appears to a slight mark like where a pontil mark was, and they did not ground it out quite deep enough. Hard to see that in the base photos of mine. I do not know for weight but it feels like maybe about 2.0 - 2.5 pounds - as like I said, it has some weight to it ? That is just a guess, as I am only casting an opinion by feel...but there is weight to it...
Added/Modified: Can you post your pix?