Nikon F 2.1cm Viewfinder 200166
- production year 1959
- black bakelite F mounting shoe, marked «F» (large) on back side
- NKT-logo and «2.1» on top, «JAPAN» on bottom of finder
- serial number on base of mounting shoe
- matches NIKKOR-O 1:4 f=2.1cm No.220235
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