Help!!!

[Hugh]

I had this Navy rear sight on Gunbroker that I thought is original. However, it has been pointed out to me that the checkering is wrong on the toggle knobs and the elev adj button. It is not a casting, but is machined. I know that the coupling link is not original, but has been altered to fit a leaf main spring. Can the experts please verify for me the authenticity or lack thereof?
Thanks, Hugh