Original Boccia 3557-01 / 3557-02 / 3557 / 811 X410S21 Leather Black 21mm watch strapThis watch strap from Boccia fits on the watch model 3557-01 / 3557-02 / 3557 / 811 X410S21. Please click on Alternatives to view all alternative straps. The lug width of this watch strap is 21mm, the middle of the strap has a width of 20mm. This watch strap has a straight end. This means that this watch strap will also fit on other watch models (from the same brand but also other brands), provided that the width of the strap is the same and the original strap also has a straight end. Please read the Product features for more information about this strap.