US Postage stamp, <a href="https://en.wikipedia.org/wiki/Alexander_Graham_Bell" class="extiw" title="wikipedia:Alexander Graham Bell"><b>Alexander Graham Bell</b></a>, issue of 1940.
Bureau of Engraving and Printing
1940-10-28
U.S. Post Office / Gwillhickers photo image, obtained from hi-res scan of US postage stamp.