That upper tang extention will be easily removable. you can clearly see the outline of the original tang. Heck, the engraving is still all there. You just need to take off the piece and the end and clean up the edge with some file work.
I would not do any case color work on this gun. It shoud be the last thing to be considered. It has nice patina and would present nicely cleaned up.
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B. Dudley
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