New Tudor watches have a 5 year guarantee, however after servicing a Tudor watch, its proper working is guaranteed by another 2 years guarantee from the date of service. Undergoing a complete overhaul guarantees a Tudor watch its proper functioning for one year from the date of Service. Any damage or deterioration due to accident or mishandling is excluded from this Guarantee. Any intervention by a third party non-authorized by Tudor or modification by adding or substituting components and accessories that are not manufactured by Tudor cancels the Guarantee.