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15 May 2014, 12:21 AM | #1 |
"TRF" Member
Join Date: Jul 2008
Location: USA
Watch: 5513~1675x2~1680~
Posts: 523
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Overhauls and adjustments
I have a decent basic understanding of what is done originally to a movement to make it a chronometer. Not an expert one but basic.
I wonder about a watch that is originally touted as "adj 5 pos plus temp & iso" after it goes through a proper rebuilding. Are the same steps taken by a good watchmaker as the manufacturer did or are those things that were done originally just accepted and the watch movement adjusted with the regulator only? I hope I am making sense with my question and if anyone wants to clarify what I'm asking I won't take offense. Thanks |
15 May 2014, 01:06 AM | #2 |
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Join Date: May 2007
Real Name: Larry
Location: Mojave Desert
Watch: GMT's
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No. The COSC test is only done once and never done again, and is done to a bare movement. (no dial,hands, rotor or case)
If a certified movement has sat very long at the manufacturer it may be completely disassembled, cleaned, oiled, and adjusted before it is fitted to a case. A good watchmaker, upon an overhaul, will likely test accuracy in 5 positions then set at an optimum point but will not subject the watch to temperature or humidity extremes.
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