Reply To: Bunn special timing regulation

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arutha
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Hi Michael and welcome,
you would be very lucky to get 5 mins per day adjustment from the regulator. This amount of loss will be down to needing a clean and service. If the watch has been serviced recently then the hairspring needs to be shortened and the collet adjusted on the balance staff to get the watch back in beat. What do you know of the watches history, has it been serviced recently?
Paul.

aruthaReply To: Bunn special timing regulation