Please help with chair ID  

Hi, please can anyone help me ID two chairs?
Purchased in Switzerland in 2000.
The swivell tilt mechannism is stamped
MADE IN NORWAY
BY RING MOBEL FABRIKK
PATENTS APLIED FOR
The chromed oval adjuster appears to have the Herman Miller logo stamped on it, there are no other marks or labels.
The bracing bars are held in place by allen screws.
the frames are chrome, the covers are conjac, sealed seams no stitching and are held in place by chromed plastic cross head screws set in black plastic suronding washers.
The bases have four legs sitting on white nylon pads.
The chairs do not have head cusions.
My novice research so far suggests eammes ea 124, vitra, circa 1958.
Please help....
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