corner seal elements 250 provided in the recess 231 at opposed ends of the recess and on opposite sides of the body portion 252 are resiliently coupled to one another thus in some embodiments the body portion 252 does not itself provide a medium through which forces between respective opposed corner seal elements 250 are transmitted in some embodiments the resilient elements 254 shown in fig6 are provided by known cartridges for attaching watch straps to a watch body in some embodiments each of the resilient elements 254 of fig6 are replaced by a conventional coil spring in some embodiments in which the body portion has an aperture 253 formed therethrough a shuttle member 255 fig6 may be provided within the aperture 253 between a pair of resilient elements 254 the shuttle member 255 is arranged to provide a medium through which forces may be transmitted between respective opposed corner seal elements 250 in some embodiments the body portion 252 is arranged to be slidable in the recess 231 in some embodiments the corner seal elements 250 are coupled to the body portion 252 by means of resilient coupling elements whereby the body portion effects coupling between the corner seal elements 250 it is to be understood that in such embodiments the body portion itself provides a medium through which forces between respective opposed corner seal elements are transmitted in some embodiments of the invention the corner seal elements 250 and body portion 252 are provided with recessed portions 251 b 251 c arranged to receive a tip seal 260 and corresponding leaf.