From 1st April 2014 the recently privatised Royal Mail withdrew their international "AirSure" service, the means that the maximum insurance available through the mail is now £250. Fully insured postage over that value is now very expensive (e.g. £70 to Japan!) full details and options available are on the web site.
UK customers are unaffected, their watches will continue to be shipped by RM Special Deliver, fully insured.