Quoted from kaneda:This doesn't really make sense though...Smaug is either Red or covered in gold in the films. He's never Red with gold highlights. I love that JJP is listening to feedback and making the pin better, but this half gold Smaug head just seems off considering it did not happen like this in the movies, at all. I think the all gold head would have worked if they would have removed the coins and even had the gold edition have exclusive sound bites that only Gold Smaug says. You see, make it mean something rather than just a different color toy.
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In the book he's sometimes known as Smaug the Golden. Also years asleep on the gold has left it embedded in his scales...
It may not be in the movie but im happy with it being part of the book, also that gold just looks awesome.