The ornamental design for a windowportion of a stampless envelope, as shown and described.
FIG. 1 is a front elevational view of a window portion of a stampless
envelope showing my new design, the remaining portions of the envelope
including additional windows being shown for environmental purposes only
and forming no part of the claimed design; and,
FIG. 2 is a front elevational view of a window portion of a stampless
envelope, the remaining portions of the envelope including additional
windows in an alternative placement being shown for environmental purposes
only and forming no part of the claimed design.
The broken lines defining the boundries, and the FIM code within the
claimed area in FIGS. 1 and 2 are shown for illustrative purposes only and
form no part of the claimed design.