Thanks, Gavin and Ian. I pasted Renaissance de-corodder and then brushed it with a brass brush. The rust is gone and the pits are clean. I later used very fine sandpaper. My concern is a) not to damage the Asadullah cartouche and b) not to change the geometry of the blade.
The biggest difficulty is finding an antique pommel cap. I have had someone offer to make one from scratch that looks extremely accurate but it's too expensive. So I prefer an antique spare one.
I have two pommel caps from LK Chen shamshir arriving, but it would be sad to put newly made ones (even after finishing and patination).
The attached photo is the result after dip in instant coffee, no pattern at all.
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