Egg chair  

I'm sorry, but your picture is terrible. A dark, blurry photo makes it very difficult to discern the details that would indicate the age of the chair. If you can post better picture particularly of the seat and the base, it would be helpful. However, from the mark you show and what appears to possibly be an intergrated seat pad I would venture to guess that it may be a very early 1st generation chair. Better pictures would help determine for sure.
 

Thank you for your feedback . i know that pictures are terrible , i will see the chair again soon and try to get more details and much better pics !!