My DCM find  

 
Correct me if I'm wrong
Frame Eames-Evans Prototype Style lcm. The back rod is straight. The glide rubber text says INSULATED DOMES OF SILENCE. Peek between the rubber and rod (butterknife) look for fins. The old domes loosened a bit wobbling the chair.Around  '50 Miller took production and tried different things to streamline. 
My pair is birch rubber stamped 10 51 and rusty chrome!  Original feet are all working fine.  One day  the spinning feet made me think. (don't do this!) I pryed off the metal cap, remaining was a rubber disk with a round head tack pushed through it into the rod, as far as I can tell the tacks ribs squeeze into the rod hole  permanently.This was costing more than a slip on boot but mine work good after 60 years.  Took an hour to sqeeze the cap back on trying many methods arrgh.
Maybe yours was kicking around at HM because it was the obsolite type so they tagged it to clear the warehouse one day. That stuff happens sometimes at warehouses especially to make room or fill rush orders. Plus the wood can be from a different era via same dimensions.

Ref: above photo glides' rubber says "INSULATED DOMES-OF-SILENCE"

Didn't see post # 30 until today.  The first photo is almost surely oak or ash; the second one really doesn't look like either of those.  Could it possibly be a re-skin -- assuming these photos are of the same chair ?

The grain on bshop22's photos look like ash to me.  Is the color accurate and original?

I remember asking the owner of the chair the same questions as well. He said that the chair had been stained at some point although he was unsure of the wood type. I'd also guess it's ash too.