Ask the seller on eBay.
I think it's the blue kind of leather.
http://www.ebay.com/itm/Herman-Miller-Charles-Eames-Electric-Blue-Leathe...
i just bought that chair ...
i just bought that chair for 600 on ebay . i am recovering in Edelmen leather that chair was made after 1975. the leather is a smooth cowhide. It has a five star base mine has a a 4 star base . and i wanted to change it to the five star but I was told it would diminish the value . nice looking .
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