No, they are shown in order. Numbers 5 & 6 were originally the same. After the initial Swiss evaluation, #6 was subsequently "improved" by making relief cuts on the rear frame "ears" to make the gun lighter and adding a manual safety to the grip safety.
One of the more bizarre things about the #5 switch was that fake grips were put on the real #5 and the original grips were put on the substitute fake! You can see from the photo that the grips do not even fit the fake properly.
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If it's made after 1918...it's a reproduction
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