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Another company that does their movement entirely inhouse is Seiko, from the low end to high end Grand Seiko and under the to lube that they used for the movement. They perform their own accuracy certification on the Grand Seiko as well.
I read that One of the issue regarding Omega co-axial 2500A and 2500B are the co-axial excapement was not designed to run at 8 bps, so in the 2500C, Omega reduce the beat rate to 7 bps and it has been much more reliable since.
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