Below is a letter from 1929 confirming reception of WTIC in New Jersey:
Here is the stamp referred to:
As well as an enclosure telling about WTIC:
The QSL Letter and enclosure are courtesy of Mike Schultz. Check out his site The Reverse Time Page at http://uv201.com/ a virtual hoard of early radios, vacuum tubes, electric clocks, and unusual technological debris of the past. The stamp is part of the WTIC archives.