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There was a lid on e-Bay today that had SMARTS on it. Out of curiosity I did a search and came across a link that showed the diamond with a raised G inside it. I see that several members have already touched on some of the things that are in the link but I will include it with this post for general purposes.
http://toponautic.blogspot.com/2014/02/james-smart-manufacturing-cast-iron.html