I recently visited the Portland Observatory, an early watch and signal tower in Maine and I believe the only one still standing since radio communication rendered them obsolete.

The tower was built by a former seaman, Lemuel Moody and he used the observatory to create incredibly accurate charts/maps of the surrounding area. On one such map dated 1825 was the below coat of arms.

http://www.americanheraldry.org/forums/attachment.php?attachmentid=1432&stc=1&d=1436650564