The ornamental design for a bobeche, as shown and described.
FIG. 1 is a left side view of the bobeche, with the right view being a
mirror image of FIG. 2 in accordance with the present invention;
FIG. 2 is a top view of the bobeche in accordance with the present
invention; and,
FIG. 3 is a bottom view of the bobeche in accordance with the present
invention.
Any dashed lines depict environment and are not part of the claimed design.
In addition, the stippling shown in the drawing is for shading purposes,
and does not form a part of the claimed design.