The ornamental design for an oillamp, as shown and described.
FIG. 1 is a top plan view of an oil lamp embodying my new design;
FIG. 2 is a side elevational view thereof, the opposite side being
substantially a mirror-image but for the view of the feet;
FIG. 3 is a fragmentary side elevational view thereof as seen from the
right of FIG. 2 with the wall of the lamp broken away to show the interior
wick structure, the side seen from the left of FIG. 2 being a
mirror-image;
FIG. 4 is a bottom plan view thereof on a reduced scale.