If it were mine I would have the dirt and dark stain on the upper right removed. I agree that some dirt/wear on an item can add to it's coolness, but those are detracting from the piece, imo.
Having framed several things in comparable sizes, doing a nice archival/museum glass frame job will run you about $300. I can't speak to cleaning costs, but for some reason the $600-800 range is sticking in my head. Keep in mind not what you spent on it, but what it's worth to you. I have spent $400 framing something I spent 50 bucks on just because I loved it and wanted to enjoy/protect it indefinitely.
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Items for sale or trade here UPDATED 3-16-18
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