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Note that the setting lever screw is an exception to the rule about screw placement, it can be in different places in stem set and pin set varieties of the same movement, or absent altogether if the keyless work is negative set.
The shape of the cocks and bridges is more of an aesthetic consideration; so long as all the pivot holes and screw holes are in the same places, then bridges of very different shapes can be freely interchanged.
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The fingerprints in the Bestfit book can be used to easily identify these movements.In fact, the apparently huge variety of Swiss watches is explained by this phenomenon: once the basic layout in a round movement of the barrel, train wheels, escapement and balance was arrived at, there was little scope, let alone need, to change it.Manufacturers altered the appearance of their movements by changing the top plates, but the basic layout remained much the same.These are smaller, simpler, and less easy to identify with certainty.The setting lever spring was an evolution of the earlier simple cover plate that simply kept all of the parts of the keyless work in place.