The ornamental design for a skateboarddeck, as shown and described.
FIG. 1 is a perspective top view of a first embodiment of a skateboard deck;
FIG. 2 is a front elevation view of the first embodiment of the skateboard deck;
FIG. 3 is a rear elevation view of the first embodiment of the skateboard deck;
FIG. 4 is a left side elevation view of the first embodiment of the skateboard deck;
FIG. 5 is a right side view of the first embodiment of the skateboard deck;
FIG. 6 is a top plan view of the first embodiment of the skateboard deck;
FIG. 7 is a bottom plan view of the first embodiment of the skateboard deck;
FIG. 8 is a perspective top view of a second embodiment, which is a mirror image of the first embodiment of the skateboard deck;
FIG. 9 is another top plan view of the first embodiment of the skateboard deck shown in an alternate environment; and,
FIG. 10 is another top plan view of the second embodiment of the skateboard deck shown in an alternate environment.
The broken lines shown are included for the purpose of illustrating the unclaimed portions of the skateboard deck and form no part of the claimed design.