I have one from the mid-'70's. Ash veneer.
They (HM) calls it aniline, I call it paint. OK, maybe it's opaque black lacquer. I haven't tested it, but it is certainly original whatever it is. Original cushions were tan that I switched for a set of dark brown resulting in sort of a reverse of the typical scheme.
Fairly reliable source has it as one of a pair custom ordered for an office in Cambridge, MA. I am the 3rd owner.
I'm happy with the oddball chair. Everybody and their cousin has black on rosewood, though I think HM recently began offering ash veneer on ES670/671 again. Maybe it was always a custom order option?
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