yep, you were right
i found this about them
Light Office Chairs
NS 101, NS 102, NS 103, NS 104, NS 105, NS 106
Covering: Milwon and Miltoo
Armrests: black foam
Lower frame: polished aluminum
H 34"—35 1/2", W 25", D 27" (seating height: 17"—18 1/2")
This family of office chairs included swivel side chairs (NS 101, 102), swivel armchairs (NS 103, 104), and tilt-swivel armchairs (NS 105, 106). They could be outfitted with glides (NS 101, 103, 105) or casters (NS 102, 104, 106).
Produced by Herman Miller from 1971 to 1978.
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