I thought rust as well, the pin is quite rusty so it would make sense.
This is the result of cleaning with hot soapy water and a cotton bud, then a tooth brush then a wooden skewer. I don't think it's made the slightest difference.
I've also noticed (once I put my glasses on to clean it) that someone before me has cleaned it, possibly using a dremel, and that the scroll above the word police has lost a lot of it's shine. The photos don't really show that damage and to be fair if I hadn't had a bright light on it I probably wouldn't have seen it, but as I don't want to make things worse it looks like it's staying as it is.
Michael
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