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Silver is always going to be better than gold for toning, due to the latter's relative resistance to chemical reaction. Toned gold is usually due to the copper mixed to produce the correct fineness. As you will be aware, left to its own devices and in a fairly clean environment, it will mostly turn black from silver oxide. Establish what the chemicals responsible for the colour scheme were and you probably have a good indicator of London's atmospheric constituents since Victorian time, though the toning stripe that looks like Britannia let one go, is probably from the fabrics found in a mint set. Though as always, a lot depends on the angle of the shot relative to light source. 15 or 20 years ago, I posted a picture taken one sunny day when I had a tray of Soho patterns on the desk, and the various colours reflected onto the ceiling enabled me to individually identify all the pieces using colour alone. There was a mixture of copper, bronzed, gilt and silver, but all were distinctively coloured. I think I lost the image a few years ago when photobucket went dysfunctional, so will have to wait for the sun to make another appearance unless someone can locate it on the forum. Having said all that, the one below is an oil painting in most lights and from most angles. Apologies to those who have already seen it.  

Often when Una and the Lion's are mentioned, you first imagine gold! For me, it will always be this gorgeous silver pattern piece I had the chance to photograph. Stunning rainbow toning, never seen anything like it.

So, I can confirm that all the S’s are serpentine and belonging to 9b with no star on breast. There is no perforation of the flan, and the rust on the reverse was not part of the coin, and has for the most part flicked off. North did not identify any ANL errors for Class 9, though Wither’s, as Coys pointed out, has recorded a London 9a piece, but also a 9b1 (which this coin is) for York (but not London). Therefore, to the best of my knowledge, this is an unrecorded obverse for London. Interestingly it arrived with a Spink ticket with 9b on it, but no mention of the legend error! Only a phone image for now!  

Minor update to this list. Some 1862 Halfpennies have a die LETTER to the left of the lighthouse. Additionally, there exists a much rarer die letter combination with the die letter A to the right of the lighthouse.