Colors on the nib seems to be toning. Where it had ink shows as bare gold color. i scratched a little bit while cleaning the nib with soap . Nib doesn't match the pen but must have been on it for a while based on the colors in the back.
To take it a part one first have to pull out the plate on the back of the feed from the back. then nib from the front and as far as i can see the feed from the back. I am worried about braking the feed so i'm not going to pull it out. plate looks to be broken from the middle and a part of it is stuck at the front. nib looks to be held between that and the feed.
I am hoping this is the matching feed for this. Although i could be wrong. given that the nib was replaced, they could have also fiddled up with the feed when changing the feed.