Released as part of the inauguration of the transatlantic airmail service. The stamp was designed by Alvin R. Meissner with a few minor changes by the post office. First day sales totaled 166,671 stamps, with 63,634 covers cancelled. The 30-cent stamp was issued for use in franking mail to be flown on regular airmail service across the Atlantic Ocean and paid for up to a half ounce to any point in Europe. (Argo People, Postage & The Post)
The principal feature of this stamp design is the insignia worn by air mail pilots: a globe with extended wings on either side and with a background of rays of light. Upon the globe are the words, "U.S. air mail." (US. Stamp Gallery)
You can research stamp prices and they do tend to change. Just remember a dealer may not buy at the prices listed below.
As of 9/2013 Ebay auctions for this item have gone as low as $1 on up to $34 each. Many retailers are currently selling this stamp any where from $2.25 on up to $20 each depending on condition and if it's a (FDC) First day cover or not.
|Stamp Number (Scott)||US C24|
|Michel Number||US 450|
|Yvert et Tellier||US PA25|
|Issue Date||May 16, 1939|
|Size||1 84/100x 75/100"|
|Designer||Alvin R. Meissner|