The matter with the antique pommel is that it comes REALLY from YAVIN 4,I fount it a couple of years ago...
To obtain ths finish,with green-blue color you have to make the pommel from brass or affiliates.
If you want to obtain this aspect with a Russ Pommel,would be possible too,because made of steel,but color will get closer to chocolate...
Not sure it will work on aluminum...
You choose you pommel,then damage it,as you want...
You can sand it to remove some chrome,but it's not necessary.
You display the pommel in earth in a glass container,closed,then you add a little bit of acid or ammonia,depending on material,and you wait,a couple of weeks or more if you can,then you open to make it dry,and then you remove.
Ah..
You have to pray,any god,no matter...
If you are lucky,the chome will flake on Russ pommel,as it did on mine.