US D471691 S1
FIG. 1 is a perspective view of an observational mailbox window mounted on a mailbox;
FIG. 2 is an elevational side view thereof;
FIG. 3 is an elevational front view of the mailbox;
FIG. 4 is an elevational back view of the mailbox;
FIG. 5 is a bottom plan view of the mailbox; and,
FIG. 6 is an elevational view of an opposite side of the mailbox showing another observational mailbox window identical in design to the observational mailbox window of FIG. 2.
The broken line showing of a mailbox is for illustrative purposes only and forms no part of the claimed design.