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9 September 2021, 04:44 AM | #1 |
"TRF" Member
Join Date: Aug 2013
Location: USA
Posts: 39
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Classique 3130
I recently had the 502 movt upgraded. It now beats at 21.6 VBH from the original 18VBH but also had the older Glucydur balance replaced with a free sprung balance enhanced with a silicone balance spring and escapement making it much more robust and allowing longer services intervals.
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