Help in identifying Eames fiberglass  

Hi Collectors! I’m from Australia, recently I found a pair of Eames PAC from a family who owned the chairs for over 30 years. One in Orange and the other in Elephant grey, and both of them have the original base + small shock mounts.

But only the orange one has embossed Herman Miller mark, the grey on has no markings at all. More interestingly, the grey one has a raised edge, but not like the first generation rope edge. Really hope to know more about this grey one. Any one can help me on this? Thanks in advance!