The orange and purple sevens also can have doubles on it.
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I have seen these old machines where it is hard to tell the difference between the red and orange on it.
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This is the right answer. First off, this guy is not some babe in the woods -- he is pulling on a $25 slot and knows the difference between orange and red on a double gold machine. Second, he hit three double orange 7's, which is a jackpot of $4,000 -- the article gives the impression that the casino is claiming only one of the symbols is an orange symbol. In fact, all three symbols are double orange 7's.
Here's a better picture of the this guy's win with the paytable:
Attachment 8038