Abstract: An immersible and disposable decorative wristwatch includes at least one watch strap that can be selectively joined at its ends and fitted over the wearer's wrist, and watch works of the quartz oscillator type, run by a battery. The watch strap is laminated and consists of a first ply made of a flexible and waterproof thermoplastic material, and a second ply placed over the first ply, which is also made of a flexible and waterproof thermoplastic material that is transparent over at least a portion of its surface. The second ply is disposed adjacent to the first ply and laminated thereto by means of thermoplastic welds which define at least one hollow hermetically sealed chamber, arranged between the ends of the set of plies so assembled. The watch works are housed within the chamber with the portion of same indicating the time facing the transparent portion of the second ply.