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I've had my custom Si for seven years and it is my favorite watch.

I'm not sure about any timekeeping difference, but the anti-magnetic properties and the satisfaction in knowing I'm wearing superior technology has been worth it for me.
Same here. Own a DC 66 and a DC 67 Si. Have never thought about measuring the difference in timekeeping.

Watch Analog watch Clock Watch accessory Measuring instrument


Watch Analog watch Clock Watch accessory Wrist


Both work flawlessly and that‘s what counts.
 
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