The ornamental design for a rollerstamp with letteropener, as shown and described.
FIG. 1 is a front side perspective view of a roller stamp with letter opener with the letter opener retracted and a cap attached;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a rear view of FIG. 1;
FIG. 4 is a left side view of FIG. 1;
FIG. 5 is a right side view of FIG. 1;
FIG. 6 is a top view of FIG. 1;
FIG. 7 is a bottom view of FIG. 1;
FIG. 8 is a front perspective view of the roller stamp with letter opener of FIG. 1 with the letter opener protruded; and,
FIG. 9 is a front perspective view of the roller stamp with letter opener of FIG. 1 with the cap removed.
The broken lines in the drawings are for the purpose of illustrating portions of the roller stamp with letter opener that form no part of the claimed design.