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Bank transfer. Handover watch in person, video record the handover and get buyer to sign a receipt saying they have received the watch and are happy with it etc.
I did this earlier this year when I sold some high value items to a person I didn’t know.
Selling to an individual? bank transfer and then immediately move the funds.
I personally wouldn't if its that kind of money, sell to someone else like watchtrader.co.uk.