Watch Strap with Three-level Adjustable Lock

FIG. 1 is a front right perspective view illustrating a watch strap with three-level adjustable lock according to a first embodiment of the claimed design; FIG. 2 is a front view of the watch strap with three-level adjustable lock according to the first embodiment; FIG. 3 is a rear view of the watch strap with three-level adjustable lock according to the first embodiment; FIG. 4 is a left side view of the watch strap with three-level adjustable lock according to the first embodiment; FIG. 5 is a right side view of the watch strap with three-level adjustable lock according to the first embodiment; FIG. 6 is a top view of the watch strap with three-level adjustable lock according to the first embodiment; FIG. 7 is a bottom view of the watch strap with three-level adjustable lock according to the first embodiment; FIG. 8 is a front right perspective view illustrating the watch strap with three-level adjustable lock according to the first embodiment, shown in an alternate configuration; FIG. 9 is a front right perspective view illustrating the watch strap with three-level adjustable lock according to the first embodiment, shown in an alternate configuration; FIG. 10 is a front right perspective view illustrating the watch strap with three-level adjustable lock according to a second embodiment of the claimed design; FIG. 11 is a front view of the watch strap with three-level adjustable lock according to the second embodiment; FIG. 12 is a rear view of the watch strap with three-level adjustable lock according to the second embodiment; FIG. 13 is a left side view of the watch strap with three-level adjustable lock according to the second embodiment; FIG. 14 is a right side view of the watch strap with three-level adjustable lock according to the second embodiment; FIG. 15 is a top view of the watch strap with three-level adjustable lock according to the second embodiment; FIG. 16 is a bottom view of the watch strap with three-level adjustable lock according to the second embodiment; and FIG. 17 is a front right perspective view illustrating the watch strap with three-level adjustable lock according to the second embodiment, shown in an alternate configuration; and, FIG. 18 is a front right perspective view illustrating the watch strap with three-level adjustable lock according to the second embodiment, shown in an alternate configuration. The portions of the watch strap with three-level adjustable lock shown in broken lines form no part of the claimed design. The broken line showing of a watch is for the purpose of illustrating environmental structure and forms no part of the claimed design.