Mine has "C", it means Nikon Integral Coating has been applied,
but it is the same as Nikkor-S Auto 50mmF/1.4 except coating
and also changed to 7 iris brades.
The lens is also once OHed, but not AIed like Nikkor-H 50mmF2.
This Pre-Ai lens cannot be mounted to Nikon's modern dSLRs.
$100 @1974 brand new ($1 was 300 Yen) ... $ = US$ in our HP

Info > https://imaging.nikon.com/imaging/information/story/0044/