F-stop numbers, FL, and red dot (mounting marker) area
of MD Rokkor 50mm F2 which are not used for this lens.

Of course all those DoF marks and distance markers are
way off except infinity mark, but the looks is important.
That hood is a hand-made one, got it in Tokyo a long ago.

The red mount marker was transplanted to MD Zoom Rokkor
24-50mmF/4 which came without the red marker, because of
this this zoom lens was fairly cheaply obtained at eBay.
See > http://www.pbase.com/kkawakami/image/166409118