That is a strange thing to see and it would be interesting to hear how you came by it. I am thinking it was a prototype or a reject. If you had your own machine shop I suppose it might not be cost prohibitive. However, I can't imagine a shop charging less than US$400 or aroung 200 GBP to do the job and I am rather certain you could get a quite decent head for that or less.
It will surprise me if others are not also amused by this piece and, I expect, they will chime in with other opinions as to price/value.
Richard