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I saw a few pieces at the British Museum when they had their history of timepieces exhibition (the final exhibit was a DW5600, which I thoroughly enjoyed) which were in a similar state after being used as marine chronometers for years at a time. But yeah, unlikely to get that cycling to Dulwich. More's the pity.
If you read that thread, the owner of that watch used three or four chemical treatments to get his brass looking like that. Not sure its possible naturally.