You can checkout this Nikon 1200mm Nikkor-P.C f/11 lens (with AU-1 focusing unit) Listed at eBay US. There were only 359 pieces produced.
Below are the detailed specs:
- Focal length: 1,200mm
- Maximum aperture: 1:11
- Lens construction: 5 elements in 5 groups
- Picture angle: 2°
- Distance scale: Graduated both in meters and feet up to 43m or 139 ft (50m/150 ft with AU-1)
- Aperture scale: f/11- f/64 (IR focus shift: 8.9mm (turn ring left))
- Aperture diaphragm: Manual
- Exposure Measurement: Stop-down method
- Attachment size: 122mm (P=1.00)
- Lens Hood: Built-in telescopic type
- Filter: 122mm screw-in
- Dimension: 135mm dia x 732mm length (5-5/16 in. x 28-13/16 in.); 135mm dia x 922mm length (5-5/16 in. x 39-1/16 in.) with focusing unit; 135mm dia x 732mm length (5-5/16 in. x 28-13/16 in.) with AU-1
- Weight: 3.1kg (109.5 oz); 4.3kg (151.9 oz) with focusing unit; 5.5kg (194.3 oz) with AU-1
- Accessories: 135mm slip-on feather front cap (108 – 04 – 400), slip-on leather rear cap, focusing unit (108 – 00 – 600)