Shipping a watch to Hong Kong

Hi

I am selling a watch to a buyer in Hong Kong. Is there something different to usual that needs doing? The buyer says that watches do not pay VAT or import into Hong Kong.

I mean, should I fill invoice for customs as usual with UPD, do separate Secursus, and all done?

Or is there a form or something special for Hong Kong?

Thanks if you reply with your experience

Franco, Sheffield