I don't understand this question. The name is different? That's not really a physically difference. Names are kind of an abstract concept. I guess the price is also a non-physical difference too.
I can only assume that the movements are different as well. Which would explain the difference in price. Let me do some research and I'll try and come back to you on that question.
kingcarlos, the 856 has a movement called the SW300.
The movement in the 556 is called the 2824-2. I don't know anything about the movements but would guess that the difference has something to do with the price.
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