The ornamental design for a posterbed, as shown and described.
FIG. 1 is a right front perspective view of a poster bed according to an embodiment of the invention, the perspective view from the left front being a mirror-image thereof.
FIG. 2 is an end view of a headboard of a poster bed according to an embodiment of the invention.
FIG. 3 is a side view of a poster bed according to an embodiment of the invention, the opposite side being a mirror-image thereof.
FIG. 4 is an end view of a footboard of a poster bed according to an embodiment of the invention; and,
FIG. 5 is a top view of a poster bed according to an embodiment of the invention.
The dashed lines showing the bed frame are for illustrative purposes only and form no part of the invention.
The headboard and footboard are shown separately for convenience of illustration.