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6S20 appears to be the same as the OS20 we currently use but with 1/20 second chronograph function. I remember seeing these before.
 

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Discussion Starter · #3 ·
6S20 appears to be the same as the OS20 we currently use but with 1/20 second chronograph function. I remember seeing these before.
If I read the specs correctly, the stats on the balanceable weight of hands are different as well. I may be wrong about that, though.
 

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I would suggest looking into the Ronda 5050 B movement.
 
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