NIKKOR-P·C Auto 1:5.6 f=400mm 256988 (Factory AI'd)

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«Nikon»
Production year 1973
958th of approx. 1'400 lenses produced (first 400mm f/5.6 «C» lens was #256031)
5 elements in 3 groups, use of fluorite crystal and special rare-earth glass (ED-glass?)
Picture angle 6°10′
Built-in retractable lens hood
Black front ring, filter ∅ 72mm
Lens data engraved on focusing ring
Distance scale graduated in meters & feet from 5m (16 ft.) to infinity (∞)
«LENS MADE IN JAPAN» on chrome DOF-ring
Tripod collar, revolving
Cross ribbed aperture setting ring, Factory AI modification, kit No.55
Aperture scale f/5.6 to f/32, 7 iris blades
Bayonet fixed by 5 cross-head screws
Dimensions approx. 84.5mm ∅ x 255mm
Weight approx. 1,400g
Nikon 72mm screw-in front lens cap
Nikon LF-1 rear lens cap